Hi

Let x represent time in minutes it takes to fill the tank together

Per minute is the Equalizer

1/45 + 1/55 = 1/x  Mulitplying each term by 45*55x so as all denominators = 1

55x + 45x = 45*55

100x = 45*55

x = 45*55/100

x = 27.75 min, time in minutes it takes to fill the tank together

 

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