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Pipe A can fill a tank in 20 minutes and Pipe B in 30 minutes respectively. Pipe C can empty the same in 40 minutes. If all the three pipes are opened together, find the time taken to fill the tank?
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- percentage work done by A =100/20 = 5
percentage work done by B =100/30 = 3.33
percentage work done by C = -100/40 = -2.5 (as c is doing negative work)
work percentage * time = 100 ,(100 % work is done )
(5+3.33-2.25)*time = 100
time = 100/5.83 = 17.15 min
= 17 minutes and 9 seconds
- 10 years agoHelpfull: Yes(2) No(0)
- (1/20+1/30)-1/40=7/120
time taken to fill the tank=120/7=17+1/7 mins
- 10 years agoHelpfull: Yes(2) No(0)
- 1/20+1/30-1/40=7/120
time taken to fill the tank is 120/7 - 10 years agoHelpfull: Yes(0) No(0)
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