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 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?

A cuboidal water tank is 6 m long 5 m wide and 4.5 m deep. How many litre of water can it hold ?

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 ?

Water is running into a conical vessel, 15 cm deep and 5 cm in radius, at the rate of 0.1 cm^2 /sec . When the water is 6 cm deep, find at what rate is the water level rising?

The rain which fall on a roof 18 m long and 16.5 m wide is allowed to be stored into a cylindrical tank 8 cm diameter. If it rains 10 cm on a day, what is the rise of water level in the tank due to it ?

A man can swim with a speed of 4.0 km//h in still water. How long does he take to cross a river 1.0 km wide if the river flows steadily at 3.0 km//h and he makes his strokes normal to the river current? How far down the river does he go when he reaches the other bank ?

Water is flowing at the rate of 3km/h through a circular pipe of 20 cm internal diameter into a circular pipe of into a circular cisten of diameter 10m and depth 2 m. in how much time, will the cistern be filled?

A plastic box 1.5 m long, 1.25 m wide and 65 cm deep is to be made. Its is opened at the top. Ignoring the thickness of the plastic sheet: determine the area of the sheet requried for making the box.