If Tom and Huckleberry working at their respective rates can each whitewash 600 square feet of fence in x and y hours, respectively, how long will it take both of them working together at their own rates to whitewash 600 square feet of fence?
(1) x - y = 1
(2) (xy)/(x + y) = 6/5
Combined = 1/([1/x) + (1/y)] = xy/(x+y)
ReplyDeleteB is the way to go