Multiplying and Dividing Functions

The time it takes Jessica to do her work and the amount of work she does during the day depends on how many hours she slept the previous night. Let $W(h)=h^{2}-h-6$ be the function that shows how much work she does and let $T(h)=-h^{2}+28h-75$ be the function that shows how much time, in total, it takes her to do her work. What is the function that represents how much Jessica works per hour?