A can do a piece of work in 60 days. He worker for 15 days and then B alone finishes the remaining work in 30 days. The two together can finish the work in
A). 24 days
B). 26 days
C). 28 days
D). 30 days
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a do work in 15 days (1/60)*15 = 1/4
1/4 work done by A
ramaining work 1-1/4 = 3/4
now if B do work in 30 days then
(4/3)*30 = 40days
B complete work in 40 days
then
(1/60 + 1/40)
24 days