Multiple Choice Questions on A motorboat whose speed is 15 km hour in still water goes 30 km downstream and comes back in a total........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

A motorboat whose speed is 15 km hour in still water goes 30 km downstream and comes back in a total...........

Quantitative Aptitude ( CCS) Boats and Streams
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    A motorboat, whose speed is 15 km/hour in still water goes 30 km downstream and comes back in a total of 4 hours 30 minutes. The speed of the stream (in km/hour) is

    4

    Incorrect Answer

    5

    Correct Answer

    6

    Incorrect Answer

    10

    Incorrect Answer
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    Explanation:

    Let the speed of the stream be x km/hr. Then,

    Speed downstream = (15 + x) km/hr,

    Speed upstream = (15 - x) km/hr.

    30/ + 30/ = 4 1
    (15 + x) (15 - x) 2
    900/ = 9/
    225 - x2 2

     9x2 = 225

     x2 = 25

     x = 5 km/hr

    Hence, option 2 is the correct answer.

     

    By: Amit Kumar
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