Question

A and B together can do a piece of work in 15 days which B and C together can do in 20 days. After A has been working at it for 3 days and then by B for 11 days & then C finishes it in 20 days. In how many days B could finish the work?

A 48 days
B 24 days
C 60 days
D 30 days
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