A train 200 meters long traveling at 72 km/h crosses a platform in 25 seconds. What is the length of the platform?

Explanation

Speed in m/s = 72 * (5/18) = 20 m/s. Total distance = Speed * Time = 20 * 25 = 500 m. Total distance = Train length + Platform length => 500 = 200 + Platform length => Platform length = 300 m.