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P, Q and R can do a work in 20, 30 and 60 days respectively. How many days does it need to complete the work if P does the work and he is assisted by Q and R on every third day?

/ Basic Maths Mcqs, Mathematics Mcqs, Time and Work Mcqs / By
P, Q and R can do a work in 20, 30 and 60 days respectively. How many days does it need to complete the work if P does the work and he is assisted by Q and R on every third day?

A. 10 days
B. 14 days
C. 15 days
D. 9 days