Answer to Question #7054 in Mechanics | Relativity for Susan

Question #7054
two cars traveling from the same place at the same time and travel in opposite directions. one car travels an average of 20 kph faster than the other. After 2 hours the cars are 40okm apart. find the speed of each car.
Expert's answer
Let's the first car speed be V. Then the speed of the other car is V+20 and the distance between them after 2 hours would be
D = 2V + 2(V+20).
From the other side, D=400km. Hence
2V + 2(V+20) = 400 ==> V = 80.
So, the first car's speed is 80km/h and the second one's is 80+20=100km/h.

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