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I have posted a link there to this topic so the OP can see my work.Need help with a Calculus Work problem...have answer not sure how to get to it?

A cylindrical gasoline tank 3ft in diameter and 4ft long is carried on the back of a truck and used to fuel tractors in the field. The axis of the tank is horizontal. Find the work done to pump the entire contents of the tank into a tractor if the opening on the tractor's tank is 5ft above the top of the tank in the truck. Assume gasoline weighs 42 lbs per cubic foot.

(Hint: Evaluate one integral by a geometric formula and the other by observing that the integrand is an odd function.)