Pipe a can fill a tank in 40 minutes, while pipe b takes 60 minutes to fill the same tank.
if...
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Mathematics, 21.10.2019 17:30 dai77
Pipe a can fill a tank in 40 minutes, while pipe b takes 60 minutes to fill the same tank.
if both pipes are used at the same time, how long will it take to fill the tank?
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