Final answer:
At a speed of 55MPH, a vehicle needs a 0.223 second opening to pass.
Step-by-step explanation:
In order for a vehicle to pass another vehicle safely, it needs a certain amount of space or opening. The time required to pass can be calculated using the formula:
Time = Distance/Speed
Given that the speed is 55MPH, we can convert this to the metric system by multiplying by 0.44704 to get a speed of 24.61 m/s. If we assume the opening as the length of the vehicle being passed, then we can calculate the time using the formula:
Time = 5.5m / 24.61 m/s = 0.223s
Therefore, at a speed of 55MPH, a vehicle needs a 0.223 second opening to pass.