A drive-through restaurant can serve 20 cars per hour. The effective capacity and efficiency of this drive-through is known to be 15 and 0.9 respectively. What is the minimum number of drive-through needed to achieve an anticipated servicing of 500 cars per 9-hour a day?

b) A production line has three stations and the first station can process a unit in 10 minutes. The second station has two identical machines, each of which can process a unit in 12 minutes. The third station can process a unit in 8 minutes. What is the hourly capacity of this production line?