A cistern has 3pipes A, B and C. A and B can fill it in 3 hours and 4 – McqOptions

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1.	A cistern has 3pipes A, B and C. A and B can fill it in 3 hours and 4 hours respectively while C can empty the completely filled cistern in 1 hour. If the pipes are opened in order at 3, 4 and 5 p.m respectively, at what time will the cistern be empty ?
A.	6: 15 p.m
B.	7:12p.m
C.	8:12p.m
D.	8
Answer» C. 8:12p.m

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