Multiple Choice Questions on A boat can travel 20 km downstream in 24 min The ratio of the speed of the boat in still water to th........... for IBPS RRB - Office Assistant/ Clerical Exam Preparation

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Multiple Choice Questions

A boat can travel 20 km downstream in 24 min The ratio of the speed of the boat in still water to th...........

Quantitative Aptitude(IBPS RRB CL) Boats and Streams
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    A boat can travel 20 km downstream in 24 min. The ratio of the speed of the boat in still water to the speed of the stream is 4 : 1. How much time will the boat take to cover 15 km upstream?

    20 min

    Incorrect Answer

    22 min

    Incorrect Answer

    25 min

    Incorrect Answer

    30 min

    Correct Answer
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    Explanation:

    Down speed =20/24*60=50km/hr
    4:1 =4x:x
    Downstream speed = 4x+x=5x
    Upstream speed = 4x-x=3x
    5x= 50; x=10
    so up speed 3*10=30
    Time = 15/30*60= 30min.

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