Final answer:
To determine a safe distance to cross a road, consider the speed and length of cars. Given an average car length of 3.5 meters, you should be able to walk at least 2 meters further than the car's width. If a car is initially traveling at 60 km/hr, the safe crossing distance in car lengths can be calculated.
Step-by-step explanation:
When it comes to determining a safe distance to cross a road, it is important to consider the speed and length of the cars. According to the given information, the average car length is 3.5 meters. To cross safely, you should be able to walk at least 2 meters further than the width of the car, which is a total of 4 meters. Assuming a car is initially traveling at 60 km/hr (16.7 m/s), you can calculate the number of car lengths that would be equivalent to the safe crossing distance.
To calculate the safe crossing distance in car lengths, divide the safe crossing distance (4 meters) by the average car length (3.5 meters).
Safe crossing distance in car lengths = 4 meters / 3.5 meters = 1.14 car lengths.