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Question:

A river 3 m deep and 40 m wide is flowing at the rate of 2 km per hour. How much water will fall into the sea in a minute?

Solution:

Given: Ratio of flow of water = 2 km/hour = (2000/60) m/min
→ h = 3 m
→ b = 40 m
→ Volume of water flowed in 1 min = (2000/60) × 40 × 3 = 4000 m³