A local ice-cream parlor has 100 customers in the "rush" hour between 5PM and 6PM (assume that the customers arrive according to a uniform distribution, i.e., evenly spread out during the hour). If there are two employees who scoop the ice-cream for the customers, and one more who deals with the payments, then what is the Taktzeit for the ice-cream scoopers?
a- 72 seconds
b- 100 seconds
c- 36 seconds
d- 50 seconds