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The formula for the distance (in meters) that you will travel from the moment you hit the brakes until a full stop is: speed ./. 3 x 10. So at your speed that will be: 30 ./. 3 = 10 x 10 = 100 meters. Sounds like a lot, but if you brake as a reaction to a traffic situation ahead of you, you will travel on for a full second before you even hit the brakes, even if you're alert.

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Q: At 30 mph how long it takes to stop the car?
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