A PE engineer interview question

The time required for four people to complete this process is:1/(1/6+1/7+10+1/2) = 2.03s.

Therefore, the time interval between products flowing down the assembly line must be greater than 2.03 seconds, otherwise the process cannot be completed; But the time interval should not be too long, otherwise the production efficiency is not high, which can generally be set at 2.2s

This is my understanding, I hope I can help you.