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Speed of the first train = 72 km/hr = (72 × 1000) ÷ 3600 = 20 m/s Speed of the second train = 54 km/hr = (54 × 1000) ÷ 3600 = 15 m/s Relative speed = 20 + 15 = 35 m/s Total length = 250 + 300 = 550 meters Time to cross = 550 ÷ 35 = 15.71 seconds ≈ 15.7 seconds Correct Option: a)
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