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Speed of the shorter train = 150/12 = 12.5 m/sec Let the speed of the longer train be x km/hr According to the question, ⇒ (12.5 + x) = (150 + 270)/14 ⇒ 12.5 + x = 420/14 ⇒ x = 30 – 12.5 = 17.5 ⇒ x = 17.5 x 18/5 = 63 km/hr
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