pipe A can fill a tank in 3 hours, while pipe B takes 6, c takes 18. if pipes are opened simultaneously how long will it take to fill up tank

• A *3=W
  B*6=W
  C*18=W
  (A+B+C)*x=W
  solving we get together they work in 9/5 hours
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• x/3 + x/6 + x/18=1
  so x=1.8 hrs
  ans=1.8 hrs
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• 2 hours
  1/3+1/6+1/18= 9/18=1/2
  three takes 2 hours to fill tank
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