Pipe A is an inlet pipe that can fill an empty cistern in 69 hours. Pipe B can drain the filled cistern in 46 hours. When the cistern is filled, the two pipes are opened one at a time for an hour each, starting with Pipe B. How long will it take for the cistern to be empty?

Pipe A is an inlet pipe that can fill an empty cistern in 69 hours. Pi

1.	Pipe A is an inlet pipe that can fill an empty cistern in 69 hours. Pipe B can drain the filled cistern in 46 hours. When the cistern is filled, the two pipes are opened one at a time for an hour each, starting with Pipe B. How long will it take for the cistern to be empty?
A.	1 days 13 hours
B.	11 days 10 hours
C.	11 days 7 hours
D.	11 days 12 hours
Answer» C. 11 days 7 hours

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Pipe A is an inlet pipe that can fill an empty cistern in 69 hours. Pipe B can drain the filled cistern in 46 hours. When the cistern is filled, the two pipes are opened one at a time for an hour each, starting with Pipe B. How long will it take for the cistern to be empty?

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