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    Question

    Train β€˜A’ travelling with a speed of 90 km/h can

    cross a pole in 20 seconds. If the length of train β€˜B’ is 60% less than that of train β€˜A’ and it can cross a pole in 16 seconds then speed (in km/h) of train β€˜B’ is:
    A 45 km/h Correct Answer Incorrect Answer
    B 40 km/h Correct Answer Incorrect Answer
    C 42 km/h Correct Answer Incorrect Answer
    D 47 km/h Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Speed of train β€˜A’ = 90 Γ— (5/18) = (25) m/s Length of train β€˜A’ = (25) Γ— 20 = 500 metres Length of train β€˜B’ = 0.4 Γ— 500 = 200 metres Speed of train β€˜B’ = (200/16) Γ— (18/5) = 45 km/h

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