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    Question

    Train тАШAтАЩ travelling with a speed of 42 km/h can

    cross a pole in 6 seconds. If the length of train тАШBтАЩ is 10% less than that of train тАШAтАЩ and it can cross a pole in 9 seconds then speed (in km/h) of train тАШBтАЩ is:
    A 20.2 km/h Correct Answer Incorrect Answer
    B 22.2 km/h Correct Answer Incorrect Answer
    C 25.2 km/h Correct Answer Incorrect Answer
    D 21.2 km/h Correct Answer Incorrect Answer

    Solution

    Speed of train тАШAтАЩ = 42 ├Ч (5/18) = (35/3) m/s Length of train тАШAтАЩ = (35/3) ├Ч 6 = 70 metres Length of train тАШBтАЩ = 0.9 ├Ч 70 = 63 metres Speed of train тАШBтАЩ = (63/9) ├Ч (18/5) = 25.2 km/h

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