A cylindrical water tank has a radius of 5 meters and a height of 10 meters. It is completely filled with water.

If water is drawn from the tank at a rate of 2 cubic meters per hour, how many hours will it take until the water level reaches half of its original height?

To find the time required, first calculate the volume of the cylindrical tank, and then determine how much water needs to be removed to lower the level by half.