The car covered 18 km in 0.5 hour. How fast was he moving?

Given:
S = 18 kilometers – the distance traveled by the car;
t = 0.5 hour – the period of time during which the car covered the path S.
It is required to determine v (km / h) – the speed with which the car was moving.
To determine the vehicle speed, use the following formula:
S = v * t, from here we find that:
v = S / t = 18 / 0.5 = 180/5 = 36 km / h.
In SI units (meter per second), this value will be:
v = 36 km / h = 36 * 10/36 = 10 m / s.
Answer: the car was moving at a speed equal to 36 km / h (10 m / s).