can you explain how we get 4 for the second question. (show all steps please for both)

ignore the written part please (the answers are the only thing this is correct which is (15 for first one and 4 for second question)

An assembly line operates for 8 hours per shift, 1 shifts per day, 5 days per week is to be configured for a product whole assembly comprises 10 tasks. The longest task is takes 9 minutes, the shortest task takes 3 minutes, and the sum of the task times is 60 minutes. What is the maximum cycle time that will ensure meeting the weekly output? The answer is a whole number. What is the minimum number of workstations that will ensure meeting the weekly output? The answer is a whole number Maximum cycle time: Arailable production time per wech: 815=40hrs/weekrequire)=153153406015 Minimum number of workstatians 15816012060=0.5workstations14workstapios