Multiple Choice Questions on The distance between two stations A and B is 778 km A train covers the journey from A to B at 84 km ........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

The distance between two stations A and B is 778 km A train covers the journey from A to B at 84 km ...........

Quantitative Aptitude ( CCS) Average
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    The distance between two stations A and B is 778 km. A train covers the journey from A to B at 84 km per hour and returns back to A with a uniform speed of 56 km per hour. Find the average speed of train during the whole journey.

    67.2km/h

    Correct Answer

    65.35km/h

    Incorrect Answer

    70km/h

    Incorrect Answer

    69.3km/h

    Incorrect Answer
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    Explanation:

    Average Speed=(2xy/x+y) km/hr
    =(2×84×56)/(84+56)
    =(2×84×56)/140
    =67.2 km/hr

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