Pipe A can fill an empty cistern in 14 hours. Together with Pipe B it can fill up the empty cistern in 12 hours. Therefore, Pipe B can fill the empty cistern alone in _______ hours.

Pipe A can fill an empty cistern in 14 hours. Together with Pipe B it

1.	Pipe A can fill an empty cistern in 14 hours. Together with Pipe B it can fill up the empty cistern in 12 hours. Therefore, Pipe B can fill the empty cistern alone in _______ hours.
A.	75
B.	77
C.	78
D.	84
Answer» E.

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Pipe A can fill an empty cistern in 14 hours. Together with Pipe B it can fill up the empty cistern in 12 hours. Therefore, Pipe B can fill the empty cistern alone in _______ hours.

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