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    A bus travelling at 42 km/h completes a journey in 20 hours. At what speed will it haveto cover the same distance in 12 hours?
    Question

    A bus travelling at 42 km/h completes a journey in 20 hours. At what speed will it haveto cover the same distance in 12 hours?

    A.

    68 km/h

    B.

    73 km/h

    C.

    70 km/h

    D.

    80 km/h

    Correct option is C

    ​Given:

    Speed of the bus for the original journey = 42 km/h

    Time for the original journey = 20 hours

    Time for the new journey  = 12 hours

    Formula Used:

    Distance = Speed × Time

    Solution: 

    Let the distance for the original journey be D

    Distance covered in the original journey:

    D = 42 ×20 = 840km

    Now, the new speed to cover the 840 km in 12 hours:

    New Speed = 84012=70 km/h\frac{840}{12} = 70 \, \text{km/h}​​

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