Two cars are driving along a straight section of the highway in the same direction.

Two cars are driving along a straight section of the highway in the same direction. the speed of the first car is 90 km / h, the second is 60 km / h. what is the speed of the first car relative to the second?

Given:

v1 = 90 kilometers per hour – the speed of the first car;

v2 = 60 kilometers per hour – the speed of the second car.

It is required to determine v (kilometer / hour) – the speed of the first car relative to the second.

According to the condition of the problem, both cars are moving along a straight section in the same direction. Then, to determine the relative speed, you need to use the following formula:

v = v1 – v2;

v = 90 – 60 = 30 kilometers / hour.

Answer: the first car is moving relative to the second car at a speed of 30 kilometers / hour.