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    Question

    A boy goes to school with a speed of 45 km/h and comes

    back with a speed of 30 km/h. find his average speed?
    A 39 km/hr. Correct Answer Incorrect Answer
    B 36 km/hr. Correct Answer Incorrect Answer
    C 35 km/hr. Correct Answer Incorrect Answer
    D 30 km/hr. Correct Answer Incorrect Answer
    E 32 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 × 45 × 30)/(45 + 30) Average speed = (2 × 45 × 30)/75 = 36 km/hr.

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