Mysterious Journey across Black river. [closed]

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When sarah rowed down black river with the current, she took 1 hr to go 4 miles. When she rowed back the same distance, at the same rowing speed, but against the current, her trip required 2 hrs. What is the speed in mph, of the current in black river?

algebra-precalculus

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edited Feb 1 at 22:34

saulspatz

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asked Feb 1 at 22:25

Danielle SilveroDanielle Silvero

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closed as off-topic by Noah Schweber, Gibbs, Shailesh, Leucippus, Lord Shark the Unknown Feb 2 at 7:53

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  What have you tried? Where did you get stuck? Please don't just ask us to do your homework for you. (Also, algebraic geometry isn't just any problem involving algebra and geometry)
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-1

$begingroup$

When sarah rowed down black river with the current, she took 1 hr to go 4 miles. When she rowed back the same distance, at the same rowing speed, but against the current, her trip required 2 hrs. What is the speed in mph, of the current in black river?

algebra-precalculus

share|cite|improve this question

edited Feb 1 at 22:34

saulspatz

17.2k31435

asked Feb 1 at 22:25

Danielle SilveroDanielle Silvero

1

$endgroup$

closed as off-topic by Noah Schweber, Gibbs, Shailesh, Leucippus, Lord Shark the Unknown Feb 2 at 7:53

This question appears to be off-topic. The users who voted to close gave this specific reason:

• "This question is missing context or other details: Please provide additional context, which ideally explains why the question is relevant to you and our community. Some forms of context include: background and motivation, relevant definitions, source, possible strategies, your current progress, why the question is interesting or important, etc." – Noah Schweber, Gibbs, Shailesh, Leucippus, Lord Shark the Unknown

If this question can be reworded to fit the rules in the help center, please edit the question.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  What have you tried? Where did you get stuck? Please don't just ask us to do your homework for you. (Also, algebraic geometry isn't just any problem involving algebra and geometry)
  $endgroup$
  – Noah Schweber
  Feb 1 at 22:34
  

  
  
  
  

add a comment | 

-1

-1

-1

0

$begingroup$

When sarah rowed down black river with the current, she took 1 hr to go 4 miles. When she rowed back the same distance, at the same rowing speed, but against the current, her trip required 2 hrs. What is the speed in mph, of the current in black river?

algebra-precalculus

share|cite|improve this question

edited Feb 1 at 22:34

saulspatz

17.2k31435

asked Feb 1 at 22:25

Danielle SilveroDanielle Silvero

1

$endgroup$

When sarah rowed down black river with the current, she took 1 hr to go 4 miles. When she rowed back the same distance, at the same rowing speed, but against the current, her trip required 2 hrs. What is the speed in mph, of the current in black river?

algebra-precalculus

algebra-precalculus

share|cite|improve this question

edited Feb 1 at 22:34

saulspatz

17.2k31435

asked Feb 1 at 22:25

Danielle SilveroDanielle Silvero

1

share|cite|improve this question

edited Feb 1 at 22:34

saulspatz

17.2k31435

asked Feb 1 at 22:25

Danielle SilveroDanielle Silvero

1

share|cite|improve this question

share|cite|improve this question

edited Feb 1 at 22:34

saulspatz

17.2k31435

edited Feb 1 at 22:34

saulspatz

17.2k31435

edited Feb 1 at 22:34

saulspatz

17.2k31435

17.2k31435

asked Feb 1 at 22:25

Danielle SilveroDanielle Silvero

1

asked Feb 1 at 22:25

Danielle SilveroDanielle Silvero

1

asked Feb 1 at 22:25

Danielle SilveroDanielle Silvero

1

1

closed as off-topic by Noah Schweber, Gibbs, Shailesh, Leucippus, Lord Shark the Unknown Feb 2 at 7:53

This question appears to be off-topic. The users who voted to close gave this specific reason:

• "This question is missing context or other details: Please provide additional context, which ideally explains why the question is relevant to you and our community. Some forms of context include: background and motivation, relevant definitions, source, possible strategies, your current progress, why the question is interesting or important, etc." – Noah Schweber, Gibbs, Shailesh, Leucippus, Lord Shark the Unknown

If this question can be reworded to fit the rules in the help center, please edit the question.

closed as off-topic by Noah Schweber, Gibbs, Shailesh, Leucippus, Lord Shark the Unknown Feb 2 at 7:53

This question appears to be off-topic. The users who voted to close gave this specific reason:

• "This question is missing context or other details: Please provide additional context, which ideally explains why the question is relevant to you and our community. Some forms of context include: background and motivation, relevant definitions, source, possible strategies, your current progress, why the question is interesting or important, etc." – Noah Schweber, Gibbs, Shailesh, Leucippus, Lord Shark the Unknown

If this question can be reworded to fit the rules in the help center, please edit the question.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  What have you tried? Where did you get stuck? Please don't just ask us to do your homework for you. (Also, algebraic geometry isn't just any problem involving algebra and geometry)
  $endgroup$
  – Noah Schweber
  Feb 1 at 22:34
  

  
  
  
  

add a comment | 

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  What have you tried? Where did you get stuck? Please don't just ask us to do your homework for you. (Also, algebraic geometry isn't just any problem involving algebra and geometry)
  $endgroup$
  – Noah Schweber
  Feb 1 at 22:34
  

  
  
  
  

$begingroup$
What have you tried? Where did you get stuck? Please don't just ask us to do your homework for you. (Also, algebraic geometry isn't just any problem involving algebra and geometry)
$endgroup$
– Noah Schweber
Feb 1 at 22:34

$begingroup$
What have you tried? Where did you get stuck? Please don't just ask us to do your homework for you. (Also, algebraic geometry isn't just any problem involving algebra and geometry)
$endgroup$
– Noah Schweber
Feb 1 at 22:34

add a comment | 

1 Answer
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Let $s$ be her speed in still water and $r$ the speed of the river. Going upstream, her speed relative to the bank is $s- r= 4/2= 2$ mph. Going downstream relative to the bank is $s+ r= 4/1= 4$ mph.
Can you solve the two equations, $s- r= 2$ and $s+ r= 4$ for $s$ and $r$?

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edited Feb 2 at 1:24

AryanSonwatikar

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answered Feb 1 at 22:34

user247327user247327

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

active

oldest

votes

active

oldest

votes

1

$begingroup$

Let $s$ be her speed in still water and $r$ the speed of the river. Going upstream, her speed relative to the bank is $s- r= 4/2= 2$ mph. Going downstream relative to the bank is $s+ r= 4/1= 4$ mph.
Can you solve the two equations, $s- r= 2$ and $s+ r= 4$ for $s$ and $r$?

share|cite|improve this answer

edited Feb 2 at 1:24

AryanSonwatikar

471114

answered Feb 1 at 22:34

user247327user247327

11.6k1516

$endgroup$

add a comment | 

1

$begingroup$

Let $s$ be her speed in still water and $r$ the speed of the river. Going upstream, her speed relative to the bank is $s- r= 4/2= 2$ mph. Going downstream relative to the bank is $s+ r= 4/1= 4$ mph.
Can you solve the two equations, $s- r= 2$ and $s+ r= 4$ for $s$ and $r$?

share|cite|improve this answer

edited Feb 2 at 1:24

AryanSonwatikar

471114

answered Feb 1 at 22:34

user247327user247327

11.6k1516

$endgroup$

add a comment | 

1

1

1

$begingroup$

Let $s$ be her speed in still water and $r$ the speed of the river. Going upstream, her speed relative to the bank is $s- r= 4/2= 2$ mph. Going downstream relative to the bank is $s+ r= 4/1= 4$ mph.
Can you solve the two equations, $s- r= 2$ and $s+ r= 4$ for $s$ and $r$?

share|cite|improve this answer

edited Feb 2 at 1:24

AryanSonwatikar

471114

answered Feb 1 at 22:34

user247327user247327

11.6k1516

$endgroup$

Let $s$ be her speed in still water and $r$ the speed of the river. Going upstream, her speed relative to the bank is $s- r= 4/2= 2$ mph. Going downstream relative to the bank is $s+ r= 4/1= 4$ mph.
Can you solve the two equations, $s- r= 2$ and $s+ r= 4$ for $s$ and $r$?

share|cite|improve this answer

edited Feb 2 at 1:24

AryanSonwatikar

471114

answered Feb 1 at 22:34

user247327user247327

11.6k1516

share|cite|improve this answer

share|cite|improve this answer

edited Feb 2 at 1:24

AryanSonwatikar

471114

edited Feb 2 at 1:24

AryanSonwatikar

471114

edited Feb 2 at 1:24

AryanSonwatikar

471114

471114

answered Feb 1 at 22:34

user247327user247327

11.6k1516

answered Feb 1 at 22:34

user247327user247327

11.6k1516

answered Feb 1 at 22:34

user247327user247327

11.6k1516

11.6k1516

add a comment | 

add a comment | 

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