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A can do 50% more work than B in the sam...

A can do 50% more work than B in the same time. B alone can do a piece of work in 30 hours. B starts working and had already worked for 12 hours when A joins him. How many hours should B and A work together to complete the remaining work ?

A

6 hours

B

12 hours

C

4.8 hours

D

7.2 hours

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