A can complete a certain work in 4 minutes, B in 5 minutes, C in 6 minutes, D in 10 minutes and E in 12 minutes. The average number of units of work completed by them per minute will be = ?

A can complete a certain work in 4 minutes, B in 5 minutes, C in 6 min

1.	A can complete a certain work in 4 minutes, B in 5 minutes, C in 6 minutes, D in 10 minutes and E in 12 minutes. The average number of units of work completed by them per minute will be = ?
A.	0.16
B.	0.4
C.	0.8
D.	one of these
Answer» B. 0.4