Question

P can do a piece of work in 10 days. Q can do it in 16 days. With the help of R, they finish the work in 4 days. In how many days can R alone do the whole work?

A 13(4/11) days
B 12(2/3) days
C 11(1/7) days
D 11(1/5) days
E None of these
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