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A and B can complete a piece of work in ...

A and B can complete a piece of work in 20 days and 30 days respectively. A works full time while B works half of the time. In how many days the entire work will be completed?
A तथा B किसी कार्य को क्रमशः 20 दिनों तथा 30 दिनों में पूरा कर सकते हैं | A पूरे समय कार्य करता है जबकि B आधे समय कार्य करता है | पूरा कार्य कितने दिनों में समाप्त हो जाएगा?

A

9

B

15

C

12

D

10

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