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Let the speed of the train be x Relative speed = (x + 6) km/hr ⇒ (x + 6) = (300 × 18)/(45 × 5) ⇒ (x + 6) = (5400)/(225) ⇒ x + 6 = 24 ⇒ x = 24 – 6 = 18 km/hr
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