Answer:
Bottle neck stations our the ones which take more time than the previous station because of which units received per hour our more than units created per hour creating a bottleneck.
In this case Station 2 is taking more time than station 1. (10>9)
Station 3 has 2 machines so although one machine takes more time than station one because of having 2 machines the time can be divided by 2 so there is no bottle neck here. (6<10)
Station 4 takes less time than station 2. (5<6)
Station 5 takes more time than station 4. (8>5) but station 5 is not a bottle neck because it is the last station so it is not slowing the units from going on to Β another station or the next station, because the good is finished here there is no bottle neck
The only bottle neck is station 2 because it takes more time to send one unit to the next unit compared to receiving one unit from station 1.
Explanation: