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Answer :
Given :
Rate of water flow = 2 km per hour
= \(\frac{2000}{60}\) m/min
= \(\frac{100}{3}\) m/min
Depth (h) of river = 3 m
Width (b) of = 40 m
So, we get,
Volume of water flowed in 1 min
= \((\frac{100}{3} × 40 × 3)\) \({m}^{3}\)
= 4000 \({m}^{3}\).
Therefore, in 1 minute, 4000 \({m}^{3}\) water will fall in the sea.