How long will it take to fill the tank if both pipes are working?

A tank can be filled in 18hr by pipe A alone and in 22hr by pipe B alone.
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1 Answer

fill rate 1=1/18=0.0555555

fill rate 2=1/22=0.45454545

yuze both at same time, fill rate=sum=0.1010101010

1/1010101=9.9
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