The table below gives the number of calories burned per minute for someone roller-blading, as a function of the person's weight in pounds and speed in miles per hour [from the August 28,1994, issue of Parade Magazine].

(a) Suppose that a 160 lb person and a 180 person both go 6 miles, the first at 11 mph and the second at 10 mph.
How many calories does the 160 lb person burn?
How many calories does the 180 lb person burn?

(b) We might also be interested in the number of calories each person burns per pound of their weight.
How many calories per pound does the 160 lb person burn?
How many calories per pound does the 180 lb person burn?