Arun can finish a work in 36 hours and Ballu is twice as efficient as Arun. If they work together, how many hours they will take to finish the same work?

Arun can finish a work in 36 hours and Ballu is twice as efficient as

1.	Arun can finish a work in 36 hours and Ballu is twice as efficient as Arun. If they work together, how many hours they will take to finish the same work?
A.	10
B.	12
C.	15
D.	18
Answer» C. 15

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Arun can finish a work in 36 hours and Ballu is twice as efficient as Arun. If they work together, how many hours they will take to finish the same work?

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