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    Question

    A car running with a speed of 65 km/hr takes 12 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 42.2 km/h Correct Answer Incorrect Answer
    B 62.2 km/h Correct Answer Incorrect Answer
    C 72.2 km/h Correct Answer Incorrect Answer
    D 82.2 km/h Correct Answer Incorrect Answer

    Solution

    Total distance covered by the car in 12 hours = 65 x 12 = 780 km Time taken by the car in the return journey = 0.80 x 12 = 9.6 hours Average speed = Total distance covered ÷ Total time taken Average speed of the car = (780 x 2) ÷ (12 + 9.6) ~ 72.2 km/h

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