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P and Q each working alone can do a work...

P and Q each working alone can do a work in 10 days and 15 days, respectively. They started the work together but Qleft after sometime and Pfinished the remaining work in 5 days. After how many days from the start did Q leave?

A

3 days

B

6 days

C

2 days

D

4 days

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