Question
A 180 m long train crosses another 320 m long train
running in the opposite direction in 10 seconds. If the shorter train crosses a pole in 9 seconds, what is the speed of longer train?Solution
Speed of the shorter train = 180/9 = 20 m/sec Let the speed of the longer train be x km/hr According to the question, ⇒ (20 + x) = (180 + 320)/10 ⇒ 20 + x = 500/10 ⇒ x = 50 – 20 = 30 ⇒ x = 30 x 18/5 = 108 km/hr
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