A can do a piece of work in 70 days and B is 40%more efficient then A. Then the number of days taken by B to do the same work is = ?

A can do a piece of work in 70 days and B is 40%more efficient then A.

1.	A can do a piece of work in 70 days and B is 40%more efficient then A. Then the number of days taken by B to do the same work is = ?
A.	0 dayd
B.	0 days
C.	0 days
D.	5 days
Answer» D. 5 days