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    Question

    Train A running at speed of 90 km/hr crosses a platform

    having twice the length of train in 12 sec. Train B whose length is 340m crosses same platform in 18 sec, then find the speed of train B ?
    A 72 km/hr Correct Answer Incorrect Answer
    B 108 km/hr Correct Answer Incorrect Answer
    C 75 km/hr Correct Answer Incorrect Answer
    D 144 km/hr Correct Answer Incorrect Answer
    E 54 km/hr Correct Answer Incorrect Answer

    Solution

    Let length of train A = x Length of platform = 2x Speed = distance/time ⇒ 90 x 5/18 = (x + 2x)/12 ⇒ x = 100 m = length of train A Length of platform = 100 x 2 = 200m For train B, Speed = distance/time ⇒ (200 + 340)/18 x (18/5) ⇒ 108 km/hr

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