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Question:

When you're driving at 55 mph under good driving conditions, your total stopping distance will be ____.

A at least 419 feet.
Explaination

At 55 mph under good driving conditions, your total stopping distance will be at least 419 feet:
142 feet of perception distance + 61 feet of reaction distance + 216 feet of braking distance. (The length of a football field including the two end zones is 360 feet.) Under poor driving conditions, the total stopping distance will probably be even longer.