# SOLUTION: a tank can be filled in 45 minutes and by another pipe in 55 minutes. how long will it take both to fill it?

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 Question 377656: a tank can be filled in 45 minutes and by another pipe in 55 minutes. how long will it take both to fill it?Answer by ewatrrr(10682)   (Show Source): You can put this solution on YOUR website! 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