A production line at V. J. Sugumaran's machine shop has three stations.The first station can process a unit in 5 minutes. The second station has three identical machines, each of which can process a unit in 18 minutes (each unit only needs to be processed on one of the three machines).The third station can process a unit in 7 minutes.
a) Which station is the bottleneck station?
b) What is the bottleneck time? (Answer in minutes per unit)