A train 450 m long running at 72 km/hr takes 45 seconds to cross a bridge The length of the bridge is
Speed of train = 72 km/hr = 72 × (5 / 18) = 20 m / sec If the length of bridge be x metre, then ⇒ 20 = (450 + x)/45 ⇒ 450 + x = 900 ⇒ x = 900 – 450 = 450 metre
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