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A and B undertook a work for Rs. 350. A ...

A and B undertook a work for Rs. 350. A got Rs. 150 more than that of B, when they worked together. B takes 9 days more than A, when they work individually. In how many days A and B working together can do the whole work :

A

5

B

`4 2/7`

C

`4 5/7`

D

`5 4/7`

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The correct Answer is:
B
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