A can do a work in 12 days. When he had worked for 3 days, B joined him. If they complete the work in 3 more days, in how many days can B alone finish the work?

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A can do a work in 12 days. When he had worked for 3 days, B joined him. If they complete the work in 3 more days, in how many days can B alone finish the work?

A6 days

B12 days

C4days

D8 days

Answer:

A. 6 days

Read Explanation:

work done by A for 3 days = 3/12=1/4 Remaining work = 1 - 1/4 = 3/4 work done by (A+B) for 1 day=(3/4)*(1/3)=1/4 work done by B for 1 day=(1/4)-(1/12)=2/12=1/6. B alone will complete the work in 6 days

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