Three pipes PPM

Pipe A can fill a tank in 20 h while pipe B can fill it in 10 h and pipe C can empty the full tank in 30 h. If all the pipes are opened together, how much time will be needed to make the tank full?


t = 8:34 h Wrong answer

Step-by-step explanation:

a=20 h b=10 h c=30 h  z=a1+b1c1=201+101301=603+606602=603+62=6070.1167 1/h  t=1/z=1/607=1:607=1 760=71 60=760=8.57143=8:34 h

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