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

    Question

    A train covers a certain distance at a speed of 8 km/h

    and the next same distance with a speed of 14 km/h and the next same distance with a speed of 24 km/h. find the average speed?
    A 12.6 km/hr Correct Answer Incorrect Answer
    B 30 km/hr Correct Answer Incorrect Answer
    C 45 km/hr Correct Answer Incorrect Answer
    D 37.8 km/hr Correct Answer Incorrect Answer

    Solution

    Since the distance is same in all the conditions. Therefore, Average speed = 3xyz/(xy + yz + zx) Average speed = 3 x 8 x 14 x 24/(8 x 14 + 14 x 24 + 8 x 24) Average speed = 3 x 8 x 14 x 24/(112 + 336 + 192) = 8064/640 = 12.6 km/hr

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