Question

P and Q together can do a piece of work in 15 days, Q and R together can do it in 18 days. P starts the work and works on it for 5 days, then Q takes it up and works for 15 days. Finally, R finishes the work in 14 days. In how many days can R do the work when doing it separately (in days)?

A 72
B 24
C 36
D 120
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