Pipe C and D alone can fill a tank in 4 and 5 hours, respectively. If pipe C is closed after 3 hours and atÂ the same time pipe D is opened. in how many hours will the tank get filled?_x005F_x000D_

Pipe C and D alone can fill a tank in 4 and 5 hours, respectively. If

1.	Pipe C and D alone can fill a tank in 4 and 5 hours, respectively. If pipe C is closed after 3 hours and atÂ the same time pipe D is opened. in how many hours will the tank get filled?_x005F_x000D_
A.	0.8
B.	1.25
C.	1
D.	1.5
Answer» C. 1

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Pipe C and D alone can fill a tank in 4 and 5 hours, respectively. If pipe C is closed after 3 hours and atÂ the same time pipe D is opened. in how many hours will the tank get filled?_x005F_x000D_

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