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A, B and C together can build a wall in ...

A, B and C together can build a wall in 12 days. C is four times as productive as B and A alone can build the wall in 48 days. In how many days A and B working together can build the wall?
A, B और C एक साथ 12 दिनों में दीवार बना सकते हैं। B की तुलना में C चार गुना अधिक उत्पादन करता है और A अकेले 48 दिनों में दोवार बना सकता हैं। A और B एक साथ काम करके बाद वह दीवार कितने दिनों में बना सकते हैं?

A

A)20

B

B)30

C

C)80

D

D)40

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