Question

P, Q and R can do piece of work in 48, 60 and 80 days respectively. All three began to work together but P and Q left 12 and 16 days respectively before completion of the work. In how many days the work will be done?

A 12(5/12)days
B 12(7/12)days
C 30(1/3)days
D 6(7/12) days
E None of these
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