Random
Classical Mechanics
Level
2
A train of lengths 240 m crosses a platform in 20 seconds. If the speed of the train is 72
km/hr. then the length of the platform is
180m
160m
240m
260m
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Crossing the platform includes the train length.
Hence if x is the length of platform then x + 240 is the total distance traveled by the train while crossing the platform.
Speed of train is 72 km/hr = 72000/3600 m/s = 20 m/s .
So total distance traveled by train in 20 seconds = 20 \times 20 meters = 400 meters.
That means x + 240 = 400 .