Using the following rule to calculate the speed of change of distance between each couple the car moving in one direction if speeds of these cars are constant and equal respectively 80km / h 20 m / c and 1000¼/¼¿¡/¼¿¡

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To lead measurement of speeds of the car to one size (for example in km/h). The first car moves with is fast. 80 km/h, the second 20 m/s x 3600 = 72 km/h, tretiy1000 m/min x 60 = 60 km/h. Change speed rasst. between the first and second = 8 km/h, between the second and third = 12 km/h, between the first and third = 20 km/h
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Answer add