Dhanu has a model railway. The train is $$\(61 \mathrm{~cm}\)$$ long and travels at a speed of $$\(18 \mathrm{~cm} / \mathrm{s}\)$$. It takes 4 seconds for the whole of the train to cross a bridge. Calculate the length of the bridge. ....................................... $$\(\mathrm{cm}\)$$

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