A goods train and a passenger train run on parallel tracks in the same direction. The goods train is 240 m long and runs at 45 km/h; the passenger train is 210 m long. The passenger train takes 1 minute 30 seconds to pass the goods train completely. How long would they take to cross if running towards each other?

Question

Accepted Answer

15 s. Relative (same way) =450/90=5 m/s = 18 km/h, so the passenger train runs at 63 km/h. Opposite: 63+45=108 km/h = 30 m/s → 450/30=15 s.

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