If a football player runs after his opponent 40 yards North, he fumbles then turns around and chases his opponent 20 yards South, what is his distance and displacement?

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If you put a helium-filled balloon in the refrigerator, what will happen?

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?