A and B can together finish work in 30 days. They worked at it for 10 days together & then B left. The remaining work was done by A alone in 30 more days. B alone can finish the work in

 A and B can together finish work in 30 days. They worked at it for 10 days together & then B left. The remaining work was done by A alone in 30 more days. B alone can finish the work in

A).

20 days

B). 40 days

C). 60 days

D). 90 days

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