A 100 m train at 45 km/h and a 140 m train at 63 km/h run towards each other on parallel lines. How many seconds do they take to pass each other completely?

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Accepted Answer

8. Relative speed = 45 + 63 = 108 km/h = 30 m/s. Distance = 100 + 140 = 240 m, so time = 240 ÷ 30 = 8 s.

A 100 m train at 45 km/h and a 140 m train at 63 km/h run towards each other on parallel lines. How many seconds do they take to pass each other completely?

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