9 A production line at V. Sugumaran's machine shop has three stations. The first station can process a unit in 10 minutes.

A production line at V. J. Sugumaran's machine shop has three stations. The first station can process a unit in 10 minutes. The second station has two identical machines, each of which can process a unit in 12 minutes (each unit only needs to be processed on one of the two machines). The third station can process a unit in 8 minutes. Which station is the bottleneck station?