Pipe A can fill an empty cistern in 5 hours while Pipe B lakes 6.25 hours to fill it. The two pipes areÂ opened simultaneously when the cistern is empty, but Pipe B is turned off after some time as a result ofÂ which the cistern is filled in 3.4 hours. For how many hours was Pipe B open?_x005F_x000D_

Pipe A can fill an empty cistern in 5 hours while Pipe B lakes 6.25 ho

1.	Pipe A can fill an empty cistern in 5 hours while Pipe B lakes 6.25 hours to fill it. The two pipes areÂ opened simultaneously when the cistern is empty, but Pipe B is turned off after some time as a result ofÂ which the cistern is filled in 3.4 hours. For how many hours was Pipe B open?_x005F_x000D_
A.	1.5
B.	1
C.	2
D.	2.5
Answer» D. 2.5

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