Answer
The amount of oil that had leaked from the tank between 0 to 120 minutes
|or|
The amount of gallons of oil leaked within the first two hours.
Work Step by Step
We know that r(t) is gallons per minute so that is our rate.
Within the integral we are given b=120 and a=0 so we know that we a recording the rate from the very start up to 120 minutes or 2 hours and so the answer is just a matters of putting all the information together.
