A pipe can fill a tank in 20 mins another
can fill in 30 mins. The outlet can
empty it cn 60 mins. If all three
are opened together, how much time
will be needed to fill an empty tank.
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Work done by pipe A in one minute= 1/20
Work done by pipe B in one minute= 1/30
Work done by pipe C in one minute= 1/60
Total Work done = 1/20 + 1/30 - 1/60 = 1/15
Time taken to fill the tank = 15 days
Hope this helps!
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