Correct Answer: Option C
(A + B)'s 1 day's work = (1/15 + 1/10) = 1/6.
Work done by A and B in 2 days =(1/6 x 2)=1/3.
Remaining work = (1 – 1/3)=2/3.
Now, 1/15 work is done by A in 1 day.
Therefore, 2/3 work will be done by a in (15 x 2/3) = 10 days.
Hence, the total time taken = (10 + 2) = 12 days.
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