While working 5 hours a day, X alone can cut 15 trees in 9 days. In how many days X can cut 40 trees working 8 hours a day?

While working 5 hours a day, X alone can cut 15 trees in 9 days. In ho

1.	While working 5 hours a day, X alone can cut 15 trees in 9 days. In how many days X can cut 40 trees working 8 hours a day?
A.	15
B.	18
C.	14
D.	17
Answer» B. 18