A 300 m train going at 54 km/h meets a 200 m train coming from the other side at 36 km/h, and later overtakes a 120 m goods train running at 18 km/h. How much longer does the overtaking take than the crossing?

Question

Accepted Answer

22 s. Crossing: relative 54+36=90 km/h =25 m/s, distance 300+200=500 m → 20 s. Overtaking: relative 54-18=36 km/h =10 m/s, distance 300+120=420 m → 42 s. Difference =42-20=22 s.

A 300 m train going at 54 km/h meets a 200 m train coming from the other side at 36 km/h, and later overtakes a 120 m goods train running at 18 km/h. How much longer does the overtaking take than the crossing?

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