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?

Water in a canal 6 m wide and 1.5 m deep is flowing with a speed of 10 km/h. How much area will it irrigate in 30 minutes, if 8 cm of standing water is needed ?

A rectangular tank is 80 m long and 25 m braod water flows into it through a pipe whose cross section is 25 cm^2 , at the rate of 16 km per hour. How much the level of the water rises in the tank in 45 minutes.

A farmer connects a pipe of internal diameter 20 cm from a canal into a cylindrical tank in her field, which is 10 m in diameter and 2m deep.If water flowsthrough the pipe at the rate of 3 km/h, in how much time will the tank be filled ?

A hemispherical tank full of water is emptied by a pipe at the rate of 3 4/7 litres per second. How much time will it take to empty half the tank, if it is 3m in diameter? (Take pi=22/7 )

A man rowing at the rate of 5 km per hour in still water takes thrice, as much time in going 40 km up the river as in going 40 km down. Find the rate at which the river flows.

The area of cross section of the pipe is 4.8 cm2 and water is pumped out of it and the rate of 24 km/hr. Find in litres the volume of water which flows out of the pipe in one minute.

An aeroplane leaves an airport and flies due north at a speed of 1000km per hour. At the same time, another aeroplane leaves the same airport and flies due west at a speed of 1200 km per hour. How far apart will be the two planes after 1 1/2 hours ?