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B is twice efficient as A and A can do a...

B is twice efficient as A and A can do a piece of work in 15 days. A started the work and after a few days B joined him. They completed the work in 11 days, from the starting. For how many days they worked together?

A

1 day

B

2 days

C

6 days

D

5 days

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Verified by Experts

The correct Answer is:
B
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