Working 5 hours a day, A can Complete a work in 8 days and working 6 hours a day, B can complete the same work in 10 days. Working 8 hours a day, they can jointly complete the work in:

Working 5 hours a day, A can Complete a work in 8 days and working 6 h

1.	Working 5 hours a day, A can Complete a work in 8 days and working 6 hours a day, B can complete the same work in 10 days. Working 8 hours a day, they can jointly complete the work in:
A.	3 days
B.	4 days
C.	4.5 days
D.	5.4 days
Answer» B. 4 days