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A can do a piece of work in 15 days, B i...

A can do a piece of work in 15 days, B is 25% more efficient than A and C is 40% more efficient than B. A and C work together for 3 days and then C leaves A and B together will complete the remaining work in:
A 15 दिनों में एक कार्य करता है। B, A की तुलना में 25% अधिक कुशल है और C, B की तुलना में 40% अधिक कुशल है। A और C एक साथ 3 दिनों के लिए कार्य करते हैं और फिर C चला जाता है। A और B एक साथ मिलकर शेष कार्य को पूरा करते हैं:

A

`2 1/2` days

B

`3 1/2` days

C

4 days

D

3 days

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