U, V, and W together can make a chair in 20 minutes. U and V together can make it in 25 minutes. How much time (in minutes) will W take to make the chair alone?

U, V, and W together can make a chair in 20 minutes. U and V together

1.	U, V, and W together can make a chair in 20 minutes. U and V together can make it in 25 minutes. How much time (in minutes) will W take to make the chair alone?
A.	100
B.	90
C.	60
D.	120
Answer» B. 90