Find the length of the longest pole that can be put in a room of dimensions

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.

A box made of sheet metal costs Rs 1620 at Rs 30 per square metre. If the box is 5 m long and 3 m wide, find its height.

How many person can be accommodated in a dining hall of dimensions assuming that each person requires 5 cubic metres of air?

A classroom is 10 m long, 6.4 m wide and 5 m high. If each student be given of the floor area, how many students can be accommodated in the room? How many cubic metres of air would each student get?