New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    A boy goes to school with a speed of 60 km/h and comes

    back with a speed of 40 km/h. find his average speed?
    A 48 km/hr Correct Answer Incorrect Answer
    B 36 km/hr Correct Answer Incorrect Answer
    C 37.5 km/hr Correct Answer Incorrect Answer
    D 56.25 km/hr Correct Answer Incorrect Answer

    Solution

    Since the distance travelled by a boy (going to school and coming back from school) is equal. So, average speed = 2xy/(x + y) Average speed = (2 x 60 x 40)/(60 + 40) Average speed = (2 x 60 x 40)/100 = 48 km/hr

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