# Cars A and B are moving towards each other. Vehicle speed over Earth 60 km / h Vehicle speed over ground

Cars A and B are moving towards each other. Vehicle speed over Earth 60 km / h Vehicle speed over ground 90 km / h. What is the speed of car A relative to car B

Given:

v1 = 60 km / h – speed of car A relative to the ground;

v2 = 90 km / h – the speed of vehicle B relative to the ground.

It is required to determine v (km / h) – the speed of car A relative to car B.

According to the condition of the problem, cars are moving towards each other. Let car A move in the positive direction of the X axis of the coordinate system, and car B in the negative direction. Then the relative speed of the car will be equal to:

v = v1 + v2 = 60 + 90 = 150 km / h.

Answer: the speed of car A relative to car B is 150 km / h.

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