Multiple Choice Questions on A and B are two stations A train goes from A to B at 64 km hr and returns to A at a slower speed If ........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

A and B are two stations A train goes from A to B at 64 km hr and returns to A at a slower speed If ...........

Quantitative Aptitude ( CCS) Time & distance
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    A and B are two stations. A train goes from A to B at 64 km/hr and returns to A at a slower speed. If its average speed for the whole journey is 56 km/hr, at what speed did it return?

    48 km/hr

    Correct Answer

    49.77 km/hr

    Incorrect Answer

    30 km/hr

    Incorrect Answer

    47.46 km/hr

    Incorrect Answer
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    Explanation:

    If the Average of both (two) speeds was 56 km/h,

    then the sum of both speeds must equal 56 x 2 = 112km/h because the average equals the sum divided by the number,

    eg: (speed1 + speed 2) / 2.

    We know one direction the speed was 64 km/h, so 112 - 64 = 48.

    The second leg, return speed must be 48 km/hr.

    Hence, option 1 is the correct answer.

    By: Amit Kumar
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