Question

Anil can do a piece of work in 14 days and Sunil can do the same work in 20 days. With the help of Vimal, they completed the same work in just 4 days. Then how much time can Vimal do that work alone? 

A 7(7/9) days
B 7(8/9) days
C 7(9/7) days
D 7(7/7) days
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