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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, your total stopping distance will be at least 419 feet: 142 feet perception distance + 61 feet reaction distance + 216 feet braking distance under good driving circumstances. (A football field is 360 feet long, including the two end zones.) The total stopping distance may be even longer in adverse driving conditions.