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Question 122
A river 3 m deep and 40 m wide is flowing at the rate of 2 km per hour. How much water (in litres) will fall into the sea in a minute?
Solution
Speed $$= 2km/hr = \frac{100}{3} m/min$$
Volume of water flowing into sea = Depth of river $$\times$$ Width of River $$\times$$ Rate of flow
$$=3 \times 40 \times \frac{100}{3} = 4000 m^3$$
$$1 m^3 = 1000$$ litres
Volume of water flowing into sea $$= 40,00,000$$ litres
Hence Option B is the correct answer.
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