Pipe A and B can fill a tank in 10hours and 15hours respectively.Both together can fill it in?

Pipe A and B can fill a tank in 10hours and 15hours respectively.Bo

1.	Pipe A and B can fill a tank in 10hours and 15hours respectively.Both together can fill it in?
A.	6hours
B.	7hours
C.	8hours
D.	9hours
Answer» B. 7hours

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Pipe A and B can fill a tank in 10hours and 15hours respectively.Both together can fill it in?

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