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Difference between revisions of "2008 AMC 12A Problems/Problem 7"
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==Solution 3==
 
==Solution 3==
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It will take them 15 minutes to get to shore.
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It will take them <math>15</math> minutes to get to shore.
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==See Also==
 
==See Also==
 
{{AMC12 box|year=2008|ab=A|num-b=6|num-a=8}}
 
{{AMC12 box|year=2008|ab=A|num-b=6|num-a=8}}

Revision as of 16:54, 4 June 2021

The following problem is from both the 2008 AMC 12A #7 and 2008 AMC 10A #11, so both problems redirect to this page.

Problem

While Steve and LeRoy are fishing 1 mile from shore, their boat springs a leak, and water comes in at a constant rate of 10 gallons per minute. The boat will sink if it takes in more than 30 gallons of water. Steve starts rowing towards the shore at a constant rate of 4 miles per hour while LeRoy bails water out of the boat. What is the slowest rate, in gallons per minute, at which LeRoy can bail if they are to reach the shore without sinking?

$\mathrm{(A)}\ 2\qquad\mathrm{(B)}\ 4\qquad\mathrm{(C)}\ 6\qquad\mathrm{(D)}\ 8\qquad\mathrm{(E)}\ 10$

Solution 1

It will take $\frac{1}{4}$ of an hour or $15$ minutes to get to shore.

Since only $30$ gallons of water can enter the boat, only $\frac{30}{15}=2$ net gallons can enter the boat per minute.

Since $10$ gallons of water enter the boat each minute, LeRoy must bail $10-2=8$ gallons per minute $\Rightarrow\mathrm{(D)}$.


Solution 2

We set up the following equation, where $x$ is the answer:

$\frac{30}{10-x} = 15 \Rightarrow\mathrm{x=8}$, so the answer is $(D)$.

Solution 3

It will take them $15$ minutes to get to shore.

See Also

2008 AMC 12A (Problems • Answer Key • Resources)
Preceded by
Problem 6 		Followed by
Problem 8
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25
All AMC 12 Problems and Solutions
2008 AMC 10A (Problems • Answer Key • Resources)
Preceded by
Problem 10 		Followed by
Problem 12
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25
All AMC 10 Problems and Solutions

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