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    Question

    A car running with a speed of 61 km/hr takes 20 hours to

    go from 'A' to 'B'. If on the way back from 'B' to 'A', the car takes 20% less time than it takes while going from 'A' to 'B', then find the approximate average speed of the car during the whole journey
    A 67.8 km/h Correct Answer Incorrect Answer
    B 76.7 km/h Correct Answer Incorrect Answer
    C 86.7 km/h Correct Answer Incorrect Answer
    D 96.7 km/h Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Total distance covered by the car in 20 hours = 61 x 20 = 1220 km Time taken by the car in the return journey = 0.80 x 20 = 16 hours Average speed = Total distance covered ÷ Total time taken Average speed of the car = (1220 x 2) ÷ (20 + 16) ~ 67.8 km/h

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