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A and B can do a piece of work alone in ...

A and B can do a piece of work alone in 15 and 30 days respectively. In how many days can they together complete the work ?
A और B क्रमशः 15 और 30 दिनों में अकेले किसी काम को पूरा कर सकते हैं। वे कितने दिनों में एक साथ मिलकर इस काम पूरा कर सकते हैं?

A

10

B

8

C

9

D

12

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