ANSWER
[tex]50\text{ km/hr}[/tex]EXPLANATION
To find the speed of the car, divide the distance traveled by the time taken for the car to travel that distance.
The speed of the car is:
[tex]\begin{gathered} Speed=\frac{\text{distance}}{\text{time}} \\ Speed=\frac{200}{4} \\ Speed=50\text{ km/hr} \end{gathered}[/tex]That is the answer.
