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

    Question

    The Helicopter flies along a Square field @ 100, 200,

    300 and 400 km/hours respectively. Then find the Average speed of the helicopter during the whole journey?
    A 250 kmph Correct Answer Incorrect Answer
    B 300 kmph Correct Answer Incorrect Answer
    C 220 kmph Correct Answer Incorrect Answer
    D 192 kmph Correct Answer Incorrect Answer

    Solution

    Concept of Average Speed: LCM of 100, 200, 300 and 400 = 1200 Now, Average Speed = Total distance travelled/Total time taken = (1200 ×4)/(1200/100+1200/200+1200/300+1200/400) = (1200 ×4)/25= 192 kmph

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