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UPSC 2016 CDS II Math Paper

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Question : 17

Total: 100

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 ?

6 hours
12 hours
4.8 hours
7.2 hours

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