Question

Two pipes A and B can fill a tank in 12 hours and 15 hours respectively. A third pipe C can empty the full tank in 20 hours . If all three pipes are opened together, in how many hours will the tank be completely filled ?

Q: Answer-Two pipes A and B can fill a tank in 12 hours and 15 hours respectively. A t...

Rate of A 112 tank per hour Rate of B 115 tank per hour Rate of C 120 tank per hour emptying Net rate 112 115 120 LCM of 12, 15, 20 60 112 560 115 460 120 360 Net rate 5 4 3 60 6 60 110 tank per hour Time to fill the tank 1 110 10 hours

A 10 hrs

B 18 hrs

C 12 hrs

D 24 hrs

E None of these

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Two pipes A and B can fill a tank in 12 hours and 15 hours respectively. A third pipe C can empty the full tank in 20 hours . If all three pipes are opened together, in how many hours will the tank be completely filled ?

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