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Maths Puzzle
two pipes A and B can fill the tank in 30 minutes and 45 minutes respectively.C can empty the tank in 60 minutes.When the tank is empty ,all the three pipes are opened together for 12 minutes and then pipe B is closed.how many minutes from the begining does it take for the tank to be filled?
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- part filled by pipes A,B,C together in 1 min=7/180
part filled by all in 12 min=7/15
part left=1-(7/15)=8/15
part filled by both A and C in 1 min=1/30-1/60
1/60 part filled in =1 min
8/15 part filled in =32 min
so 32 +12=44 min is answer
- 11 years agoHelpfull: Yes(3) No(0)
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