A motorcyclist drives on a highway along a railroad, along which a freight train 500 m long is moving in the same direction.

univerkov | December 3, 2020 | education

A motorcyclist drives on a highway along a railroad, along which a freight train 500 m long is moving in the same direction. How long will a motorcyclist drive past a train if the speed of the biker is 75 km / 4 and the speed of the train is 45 km / h?

Relative speed problem. Since the motorcyclist and the train are moving in the same direction, their relative speed will be: V = 75-45 = 30km / h = 8m / s
This means that the motorcyclist will drive past the train: t = 62.5 s

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