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You can run 4 laps in 10 minutes your friend can run 6 laps in 15 minutes. are these rates proportional

In the diagram, the ratio of ab to ae is (1/2) . what is the ratio of the length of to the length of ?

The boiling point of water at an elevation of 0 feet is 212 degrees fahrenheit (°f). for every 1,000 feet of increase in elevation, the boiling point of water decreases by about 2°f. which of the following represents this relationship if b is the boiling point of water at an elevation of e thousand feet? a) e = 2b - 212 b) b = 2e - 212 c) e = -2b + 212 d) b = -2e + 212