'm 0 _; 30 O _; 18 The number of gallons of gasoline in a truck's tank at time t is given by the twice-differentiable function 8, where t is measured in minutes and O s is 240. Estimate the rate at which the number of gallons of oil in the tank is Changing at time t = 140 minutes. (1 point) t(minutes) 0 30 90 180 240 8(f) (gallons) 16 15 12 7 2