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A can do a piece of work in 5 hours, B i...

A can do a piece of work in 5 hours, B in 9 hours and C in 15 hours. If C could work with them for 1 hour only the time taken by A and B together to complete the work is…

A

2 hours

B

3 hours

C

`3 1/2` hours

D

4 hours

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The correct Answer is:
A
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