John Howard, a student at the University of South Alabama, bought 6 bookcases for his dorm room. Each required unpacking of parts and assembly, which included some nailing and bolting. John completed the first bookcase in 5 hours and the second in 4 hours.

a) What is his learning rate?

b) Assuming the same rate continues, how long will the 3rd book- case take?

c) The 4th, 5th, and 6th cases?

d) All 6 cases? P