Question

A river 2 m deep and 45 m wide is flowing at the rate of 3 km per hour. Find the volume of water that runs into the sea per minute.

Answer 1

Breadth of the river = 45 m
Depth of the river = 2 m
Rate of flow of the river = 3 km/h =$\frac{3000}{60}=50\mathrm{m}\mathrm{per}\min$
∴ Volume of the water that runs into the sea per minute = $50\times 45\times 2=4500{\mathrm{m}}^3$