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A can do a work in 15 days. B is 25% mor...

A can do a work in 15 days. B is 25% more efficient than A. In how many days, working together A and B will complete the same work?
A किसी कार्य को 15 दिनों में पूरा कर सकता है, B, A की तुलना में 25% अधिक कार्य कुशल है। यदि दोनों एक साथ कार्य करते है तो इसी कार्य को पूरा करने में कितने दिन का समय लगेगा ?

A

`21/4`

B

`24/5`

C

`20/3`

D

`25/7`

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