How many square feet of wall per minute can each machine paint?

Question

Two spray paint machines are used to paint different portions of a large wall. The first machine (nicknamed "Paint Pro") is used for two hours. The second machine (nicknamed "Goldilocks") is used for an hour and a half. When they are working at the same time, they can paint 55 square feet per minute. Together they painted 5850 square feet of wall. How many square feet of wall per minute can each machine paint? 

Answer 1

Working together:

P+G = 3300 <--- 55 square feet per minute ---> 55*60 = 3300 square feet per hour

They work together for 1.5 hours ---> 3300*1.5 = 4950 square feet

So Paint-Pro paints 5850 - 4950 = 900 square feet in half hour.

1800 square feet in one hour.

Goldilocks paints 3300-1800 = 1500 square feet per hour