5. A gas station stores its gasoline in a tank under the ground. The tank is a cylinder lying horizontally on its side. If the radius of the cylinder is

5 ft, its length is 15 ft, and the top is 12 ft under the ground, write the integral to calculate the total work needed to pump the gasoline out the tank to ground level. Gasoline weighs 42 lb per cubic foot. The tank is full of gasoline.

Fig: 1