Vehicles arrive at a tollbooth according to the function (t) = 5.2 0.20t, where (t) is in vehicles per minute and t is in

Vehicles arrive at a tollbooth according to the function λ(t) = 5.2 − 0.20t, where λ(t) is in
vehicles per minute and t is in minutes. The toll booth operator processes one vehicle every 20
seconds. Determine total delay, maximum queue length, and the time that the 20th vehicle to
arrive waits from its arrival to its departure.