For Part E, how is the correct answer 33 seconds? I am so confused.

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 = 4 (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 =33 seconds (enter your response as a whole number). f) The efficiency of the assembly line with 5 workstations =% (enter your response as a percentage rounded to one decimal place)