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A certain man can row a boat at 12 miles per hour in still

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A certain man can row a boat at 12 miles per hour in still

by swerve » Mon Jun 25, 2018 3:49 pm

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A certain man can row a boat at 12 miles per hour in still water. if he is rowing against an 8 miles per hour current how long will it take him to row 6 miles?

A. 2
B. 1.5
C. 1.25
D. 0.6
E. 0.5

The OA is B.

Please, can anyone explain this PS question? I tried to solve but I need help. Thanks.
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by [email protected] » Mon Jun 25, 2018 4:05 pm
Hi swerve,

We're told that a certain man can row a boat at 12 miles per hour in still water, but he is rowing against an 8 miles per hour current. We're asked how long it will take him to row 6 miles.

Since he is rowing AGAINST a current, his speed will be DECREASED by 8 miles/hour. Thus, the man is rowing a 'new' speed of 12-8 = 4 miles/hour.

We can now use the Distance Formula:
Distance = (Rate)(Time)
6 miles = (4 mi/hour)(T hours)
6/4 = T
1.5 hours = T

Final Answer: B

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by Jeff@TargetTestPrep » Thu Jun 28, 2018 6:32 am
swerve wrote:A certain man can row a boat at 12 miles per hour in still water. if he is rowing against an 8 miles per hour current how long will it take him to row 6 miles?

A. 2
B. 1.5
C. 1.25
D. 0.6
E. 0.5
Since there is an 8 mile-per-hour current, the boat is actually traveling 12 - 8 = 4 miles per hour against the current. Therefore, the time to travel 6 miles is 6/4 = 1.5 hours.

Answer: B

Jeffrey Miller
Head of GMAT Instruction
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