Two cars move evenly on parallel roads in the same direction at speeds of 72 km / h and 15 km / h.

Two cars move evenly on parallel roads in the same direction at speeds of 72 km / h and 15 km / h. What is the speed of one car relative to another?

Given: v1 = 72 km / h, v2 = 15 km / h
Find: v rel.
Solution: The speed of one car relative to another is equal to the difference in their speeds, if they move in the same direction, and v1> v2, then v rel. = V1 – v2 = 72 km / h – 15 km / h = 57 km / h
Answer: 57 km / h



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