Question

Pipes P and Q can fill a tank in 12 hours and 15 hours

Q: Answer-Pipes P and Q can fill a tank in 12 hours and 15 hours respectively, while a third pipe C can empty...

Let the capacity of the tank be 120 unitsEfficiency of pipe A 12012 10 unitshourEfficiency of pipe B 12015 8 unitshourEfficiency of pipe C 12024 5 unitshourTank filled in 1 hour 10 8 5 13 unitsTime taken to fill 65 of the tank 0.65 12013 6 hoursTherefore, tank will get filled at 4 6 10 a.m.

respectively, while a third pipe C can empty the tank in 24 hours. If all three pipes are opened simultaneously at 4:00 a.m., at what time will the tank be 65% full?

A 10 am

B 9 am

C 9.15 am

D 10.25 am

E None of these