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    Subject

    Bank Exam

    Topic

    Jamuna Bank Ltd. 2014 (PO)

    Rafia ran from her house to school at an average speed of 6 miles per hour and returned along the same route at an average speed of 4 miles per hour. If it took her one hour in total to run to the school and come back, how many minutes did it take her to run from her house to school?

    ক)
    24
    খ)
    18
    গ)
    20
    ঘ)
    22

    Explanation

    suppose, distance=D we know, time=distance/speed at time of going=D/6 t time of coming=D/4 here, D/6+D/4=1 or,D=12/5 miles goes 1 mile in 1/6 hour goes 12/5 milein 1/6 x 12/5 hour=2/5 hour =24 minutes

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