Three pumps together

One pump fills the tank in 1.5 hours, the second in 2 hours, and the third in 3 hours 20 minutes. How many minutes will the tank fill with three pumps if they work simultaneously?

Correct result:

t =  40.9091 min


a=1.5 h min=1.5 60  min=90 min b=2 h min=2 60  min=120 min c=h2min(3+20/60)=200  s=1a+1b+1c=190+1120+1200=114500.0244  t=1/s=1/0.0244=45011=40.9091 min

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