Final answer:
A car travelling at the speed limit travels 4 meters in 0.24 seconds.
Step-by-step explanation:
The question is asking about the distance a car travels in the same time it takes to walk a distance equal to the width of the car. To find this distance, we need to use the given information. The speed limit in towns and cities is 60 km/h, and the average car length is 3.5 m. Since the width of the car is 2 m, we know that it takes 4 m to safely cross the road before the car reaches you.
We can first convert the speed limit from km/h to m/s by using the conversion factor 1 km = 1000 m and 1 h = 3600 s. So, 60 km/h = (60,000 m) / (3,600 s) = 16.67 m/s. Since the time it takes to walk a distance equal to the width of the car is the same as the time it takes a car to travel a certain distance, we can use the formula distance = speed x time. Therefore, the distance a car travels in the same time it takes to walk a distance equal to the width of the car is (16.67 m/s) x (time). To find the time, we can rearrange the formula to be time = distance / speed. Plugging in the values, we get time = 4m / 16.67 m/s = 0.24 s.
So, a car travelling at the speed limit travels 4 metres in 0.24 seconds.