Pipe A can fill an empty cistern in 15 hours while pipe B takes 25 hours to fill it. Initially pipe A is left open for some time and then closed and Pipe B is switched on immediately. In all the cistern takes 21 hours to be full. How long was Pipe A open?

Pipe A can fill an empty cistern in 15 hours while pipe B takes 25 hou

1.	Pipe A can fill an empty cistern in 15 hours while pipe B takes 25 hours to fill it. Initially pipe A is left open for some time and then closed and Pipe B is switched on immediately. In all the cistern takes 21 hours to be full. How long was Pipe A open?
A.	3 hours
B.	9 hours
C.	6 hours
D.	7.5 hours
Answer» D. 7.5 hours

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Pipe A can fill an empty cistern in 15 hours while pipe B takes 25 hours to fill it. Initially pipe A is left open for some time and then closed and Pipe B is switched on immediately. In all the cistern takes 21 hours to be full. How long was Pipe A open?

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