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      Question

      Train A running at speed of 99 km/hr crosses a platform

      having twice the length of train in 18 sec. Train B whose length is 390m crosses same platform in 36 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 142 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 ⇒ 99 x 5/18 = (x + 2x)/18 ⇒ x = 165 m = length of train A Length of platform = 165 x 2 = 330m For train B, Speed = distance/time ⇒ (330 + 390)/36 x (18/5) ⇒ 72 km/hr

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