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A can do a piece of work in 30 days. He ...

A can do a piece of work in 30 days. He completed 40% of the work and left it. B completed the remaining work in 21 days. In how many days will A and B complete 65% of the same work together?
A किसी कार्य को 30 दिनों में कर सकता है | उसने 40% कार्य पूरा कर उसे छोड़ दिया | B ने शेष कार्य 21 दिनों में पूरा किया | एक साथ मिलकर कार्य करते हुए, A और B उसी कार्य का 65% कितने दिनों में पूरा करेंगे?

A

13

B

10

C

`10 1/2`

D

`13 1/2`

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