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A can do 40% of a work in 6 days and B c...

A can do 40% of a work in 6 days and B can do 30% of the same work in 3 days. They started the work together but B left after 2 days and A continued to work. In how many days was the entire work completed ?
A किसी कार्य का 40% भाग 6 दिनों में तथा B इसी कार्य का 30% भाग 3 दिनों में पूरा कर सकता है | उन्होंने एक साथ कार्य शुरू किया लेकिन 2 दिनों के बाद B हट गया और A ने कार्य जारी रखा | पूरा कार्य कितने दिनों में समाप्त हुआ ?

A

10

B

12

C

9

D

15

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