Carl can wash all the windows of his house in 8 hours. His wife Maggie can wash all the windows in 4 hours. How many hours will it take for both of them working together to wash all the windows? Answers:	A) 2	B) 2 1/4	C) 3 2/2	D) 4 1/2	E) 5
Work hrs=AB/(A+B)= 32/12 =3 2/2   Answer is 3 2/2
<result>C</result>
Carl can wash all the windows of his house in 8 hours. His wife Maggie can wash all the windows in 4 hours. How many hours will it take for both of them working together to wash all the windows?