To meet the actual demand of 1000 cars per hour, the construction engineers are considering the following plan: drivers are given the option of purchasing a radio frequency identification device (RFID) that will allow them to pass through the toll booth area quickly (one car every three seconds and there is no variability in the service time). For safety reasons, providing this option removes two of the toll booths, despite the fact that cars will only be able to enter the RFID-enabled booth one at a time. (As a result, there will be two old booths and one new RFID-enabled booth). It is estimated that 58% of the cars will use the RFID equipment, leaving 42% to drive through the manned stations