Pipe A can fill an empty cistern in 6.8 hours. Pipe B can fill it up in 10.2 hours. Only Pipe B is turned on for 1.7 hours after which Pipe A is also tuned on. How much time will it take in all to fill up the cistern?

Pipe A can fill an empty cistern in 6.8 hours. Pipe B can fill it up i

1.	Pipe A can fill an empty cistern in 6.8 hours. Pipe B can fill it up in 10.2 hours. Only Pipe B is turned on for 1.7 hours after which Pipe A is also tuned on. How much time will it take in all to fill up the cistern?
A.	5 hours 6 minutes
B.	5 hours 12 minutes
C.	5 hours 5 minutes
D.	5 hours 10 minutes
Answer» B. 5 hours 12 minutes

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Pipe A can fill an empty cistern in 6.8 hours. Pipe B can fill it up in 10.2 hours. Only Pipe B is turned on for 1.7 hours after which Pipe A is also tuned on. How much time will it take in all to fill up the cistern?

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