It is raining on a parking lot. The rate that rain falls on the parking lot, in gallons per minute, t minutes after the rain starts, is given by R(t) = 60+10. The rate at which water is carried away by the storm drain is S(t) = 50+ 5 gallons per minute. Compute the value of the definite integral below, and explain its practical significance. t+10° t+20 60 5.0⁰ (R(t) - S(t)) dt

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