SOLUTION: Mary has to fill the 15-gallon gasoline tank on her car. While she is filling the tank, she notices that it takes 15 seconds to pump one gallon of gasoline into the car. At this ra

Question 731117: Mary has to fill the 15-gallon gasoline tank on her car. While she is filling the tank, she notices that it takes 15 seconds to pump one gallon of gasoline into the car. At this rate of change, what is the approximate number of minutes it will take Mary to fill the tank with gasoline?
Answer by Lizzie92(2) (Show Source): You can put this solution on YOUR website!
If one gallon takes 15 seconds then 10 gallons will take 150 seconds. Therefore 5 gallons will take 75 seconds. 150+75=225 seconds, which equals just over 3.5 minutes.
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