Let the speed of the train be x Relative speed = (x + 4) km/hr ⇒ (x + 4) = (270 × 18)/(36 × 5) ⇒ (x + 4) = (4860)/(180) ⇒ x + 4 = 27 ⇒ x = 27 – 4 = 23 km/hr
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