Three identical blocks each take a different path from a height h to the ground. block a is released from rest and falls vertically. block b is released from rest and slides down a frictionless incline. block c is projected horizontally with an initial speed v. which block takes the longest time to reach the ground?

Consider a production line with five stations. station 1 can produce a unit in 9 minutes. station 2 can produce a unit in 10 minutes. station 3 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. station 4 can produce a unit in 5 minutes. station 5 can produce a unit in 8 minutes. which station is the bottleneck station?