Two trains of equal length are running on parallel lines in the same direction at 78 km/hr and 50 km/hr. the faster train passes the slower train in 72 seconds. The length of each train is :

180 metres

220 metres

240 metres

280 metres

Let the length of each train be x metres. Then, distance covered = 2x metres. Relative speed = (78 - 50) = 28 km/hr. = (28 * 5/18) m/sec = 140/18 m/sec .'. 2x/72 = 140/18 => 2x = 140*72/18 => x = 280 metres.

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