Trains run at 54 km/h and 72 km/h in the same direction. A man in the slower train sees the faster one pass him in 32 seconds. The slower train is 330 m long. How long would the two trains take to cross each other running in opposite directions?

Question

Accepted Answer

14 s. Relative =18 km/h =5 m/s, so the faster train is 5×32=160 m. Opposite: 54+72=126 km/h =35 m/s; distance 160+330=490 m → 14 s. (98 s uses the same-direction speed.)

Trains run at 54 km/h and 72 km/h in the same direction. A man in the slower train sees the faster one pass him in 32 seconds. The slower train is 330 m long. How long would the two trains take to cross each other running in opposite directions?

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