Two trains approach each other on parallel tracks at 54 km/h and 72 km/h. The first is 280 m long. For how many seconds does it take to go past the window of a passenger in the second train?

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Accepted Answer

8 s. Only the first train's 280 m passes the window. Relative speed =126 km/h =35 m/s → 8 s. (56 s uses the difference of speeds.)

Two trains approach each other on parallel tracks at 54 km/h and 72 km/h. The first is 280 m long. For how many seconds does it take to go past the window of a passenger in the second train?

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