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

    Question

    A car running with a speed of 50 km/hr takes 8 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 65.5 km/h Correct Answer Incorrect Answer
    B 55.5 km/h Correct Answer Incorrect Answer
    C 45.5 km/h Correct Answer Incorrect Answer
    D 75.5 km/h Correct Answer Incorrect Answer

    Solution

    Total distance covered by the car in 8 hours = 50 x 8 = 400 km Time taken by the car in the return journey = 0.80 x 8 = 6.4 hours Average speed = Total distance covered ÷ Total time taken Average speed of the car = (400 x 2) ÷ (8 + 6.4) ~ 55.5 km/h

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