Speed of train = 54 km/hr = 54 × (5/18) m/s = 15 m/s When a train crosses a bridge, it travels a distance equal to its own length and the length of the bridge. Since the train crosses a bridge in 30 sec, Distance traveled by train = 30 × 15 = 450 m ∴ Length of train + Length of bridge = 450 ⇒ Length of bridge = 450 – 130 = 320 m
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