A train 140 meters long is traveling at 72 km/h. How long will it take to cross a platform 220 meters long? MCQ with Answer and Explanation

Explanation:
Speed = 72 * (5/18) = 20 m/s. Length of train = Speed * Time = 20 * 10 = 200 meters.

Explanation:
Speed of first train = 100 / 10 = 10 m/s. Speed of second train = 100 / 20 = 5 m/s. Total distance to cross = 100 + 100 = 200 meters. Relative speed in opposite directions = 10 + 5 = 15 m/s. Time taken = 200 / 15 = 13.33 seconds.

Explanation:
Let length of train be L. Speed = L / 15. Also, Speed = (L + 100) / 25. L / 15 = (L + 100) / 25 => 25L = 15L + 1500 => 10L = 1500 => L = 150 meters.