Two trains travel in opposite direction with speeds 36 km/hr and 54 km/hr and cross each other in 10 sec. the length of 1st train is 100 m. what is the length of 2nd train ?

120 m

150 m

180 m

220 m

Relative speed Vr = (36 + 54) = 90 km/hr = 90 * 5/18 = 25 m/sec. Required time = (l1+l2)/Vr = (100 +l2)/25 = 10 => l2 = 250 - 100 => l2 = 150 m

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