Multiple Choice Questions on A boat in a river with speed of stream as 6 km hr can travel 7 km upstream and back in 4 hours What ........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

A boat in a river with speed of stream as 6 km hr can travel 7 km upstream and back in 4 hours What ...........

Quantitative Aptitude ( CCS) Boats and Streams
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    A boat in a river with speed of stream as 6 km/hr can travel 7 km upstream and back in 4 hours. What is the speed of the boat in still water?

    10 km/hr

    Incorrect Answer

    8 km/hr

    Correct Answer

    11 km/hr

    Incorrect Answer

    12 km/hr

    Incorrect Answer
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    Explanation:

    Solution: 
    Let speed of boat is x km/hr
    So
    7/(x+6) + 7/(x-6) = 4
    Solve, x = 8 km/hr [ignore the negative root because speed cannot be negative]

    By: Pranav Gupta
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