A supertrain of proper length 210 m travels at a speed of 0.95c as it passes through a tunnel having proper length 74.0 m. How much longer is the tunnel than the train or vice versa as seen by an observer at rest with respect to the tunnel

Aproduction line at v. j. sugumaran's machine shop has three stations. the first station can process a unit in 7 minutes. the second station has two identical machines, each of which can process a unit in 16 minutes (each unit only needs to be processed on one of the two machines). the third station can process a unit in 10 minutes. ▼ is the bottleneck station, with a bottleneck time of nothing minutes per unit (enter your response as a whole number).