The CUT-IT-OUT lawn mowing company consists of two people: Tina and Bill. If
Tina cuts a lawn by herself, she can do it in 3 hr. If Bill cuts the same lawn himself, it
takes him two hours longer than Tina. How long would it take them if they worked
together?

A) 1 1/2 hr
B) 2 hr
C) 1 7/8 hr
D) 2 hr