Hello, I am stuck on Part E. One person said the answer was 12 seconds, another person said the answer was 40 seconds. Both answers were incorrect. Can you please explain how to get the CORRECT answer will all of the steps broken down. Thanks!

This exercise only contains parts b,c,d,e, and f. b) Given the demand, the cycle time for the production of the new train set = seconds (round your response to one decimal place). c) The theoretical minimum number of workstations = (round your response up to the next whole number). Were you able to assign all the tasks to the theoretical minimum number of workstations? e) The total idle time per cycle for the process = seconds (enter your response as a whole number)