If Jones can paint a fence in 2 hours and White can paint the same fence in 3 hours, Jones and White working together can paint the fence in how many hours?
A. 5/6
B. 1
C. 1.2
D. 2.5
E. 5
As it takes Jones 2 hours to paint 1 total fence, he paints 1/2 the fence in one hour. White paints 1/3 of the fence per hour. Together their speed is 1/2 + 1/3 = 5/6 fence/hr. The time to paint the fence working together is 1 fence divided by 5/6 fence / hour.
=1.2 hours.