Question

A, B, and C can finish work in 5 days, 10 days, and 15 days, respectively, working alone. A and B work on the first day, A and C work on the second day, A and B work on the third day, and so on till the work is completed. In how many days the work will be completed?

A 9/4days
B 11/3days
C 7/2days
D 12/5days
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