Multiple Choice Questions on A boat can travel with a speed of 13 km hr in still water If the speed of the stream is 4 km hr find........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

A boat can travel with a speed of 13 km hr in still water If the speed of the stream is 4 km hr find...........

Quantitative Aptitude ( CCS) Boats and Streams
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    A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.

    2 hours

    Incorrect Answer

    3 hours

    Incorrect Answer

    4 hours

    Correct Answer

    5 hours

    Incorrect Answer
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    Explanation:

    speed of boat with respect to earth: 13 km/h

    speed of stream with respect to earth: 4 km/h

    We're given that the boat travels downstream, i.e. with the current, so the new speed of the boat is

    13 km/h +4 km/h =17 km/h

    The time to travel 68 km with this speed is thus

    t=68km17kmh=4 h

    Hence, option 3 is the correct answer.

    By: Amit Kumar
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