A school cafeteria is operated by five persons individually assigned to the activities listed below each of which requires the average times shown.

Activity	Avg. time, sec
1. Serve salad and dessert	10
2. Pour drinks	30
3. Serve entre	60
4. Serve vegetables	20
5. Tally and collect payment	40

For the school cafeteria flow , suggest a way to improve system capacity to 90 students per hour if you are allowed to combine steps but you may use only four employees.

Please attach a legible photo or pdf of your redesigned process flow and calculations.