1. **State the problem:** A car covers a distance of 200 km in 60 minutes. We need to find the speed of the car in metres per second (m/s). 2. **Formula used:** Speed is given by the formula: $$\text{Speed} = \frac{\text{Distance}}{\text{Time}}$$ 3. **Convert units:** - Distance: 200 km = $200 \times 1000 = 200000$ metres - Time: 60 minutes = $60 \times 60 = 3600$ seconds 4. **Calculate speed:** $$\text{Speed} = \frac{200000}{3600} = 55.56 \text{ m/s}$$ 5. **Explanation:** We converted the distance from kilometers to meters and time from minutes to seconds to get the speed in metres per second. Then we divided the total distance by the total time. **Final answer:** The speed of the car is $55.56$ metres per second.