Multiple Choice Questions on A man can row 8 kms in still water If in a river flowing at 2 km an hour it takes him 24 minutes to ........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

A man can row 8 kms in still water If in a river flowing at 2 km an hour it takes him 24 minutes to ...........

Quantitative Aptitude ( CCS) Boats and Streams
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    A man can row 8 kms in still water. If in a river flowing at 2 km an hour, it takes him 24 minutes to row to a place and come back, how far of is this place?

    4 km

    Incorrect Answer

    3 km

    Incorrect Answer

    1.5 km

    Correct Answer

    6 km

    Incorrect Answer
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    Explanation:

    Downstream speed = 8 + 2 = 10 kmph

    Upstream speed = 8 - 2 = 6 kmph

    Let distance = LCM(6,10) =30 kms

    Total Time taken = 30/6 + 30/10 = 8 hour.

    If time = 8 x 60 minutes, distance = 30 km

    If time = 24 minutes,

    Distance = (30 x 24)/(8 x 60) = 1.5 Kms

    Hence, option 3 is the correct answer.

    By: Amit Kumar
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