A motorcycle with a mass of 875 kg is moving with an eastward velocity of 70 m/s and collides with another motorcycle with the same mass. The two motorcycles get tangles together in the collision and afterwards their combined mass had a velocity of 40 m/s west. what is the initial velocity of the second motorcycle? (include direction)

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?