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    Question

    Train β€˜A’ travelling with a speed of 72 km/h can

    cross a pole in 18 seconds. If the length of train β€˜B’ is 60% less than that of train β€˜A’ and it can cross a pole in 12 seconds then speed (in km/h) of train β€˜B’ is:
    A 30 km/h Correct Answer Incorrect Answer
    B 26 km/h Correct Answer Incorrect Answer
    C 43.2 km/h Correct Answer Incorrect Answer
    D 49 km/h Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Speed of train β€˜A’ = 72 Γ— (5/18) = 20 m/s Length of train β€˜A’ = 20 Γ— 18 = 360 metres Length of train β€˜B’ = 0.4 Γ— 360 = 144 metres Speed of train β€˜B’ = (144/12) Γ— (18/5) =216/5 Β  = 43.2 km/h

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