If your speed triples, the distance required to stop increases by a factor of nine. This is because stopping distance is proportional to the square of the speed. Therefore, if you increase your speed by three times, the stopping distance becomes three squared, which equals nine times the original distance.
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You need to say the time in which that distance was travelled also to work out speed. Remember, speed is distance/time
distance travelled and time taken average speed = distance/time
You need speed to calculate this. Distance is speed / time
time it took to travel that distance
You can calculate a speed by dividing a distance by the time it takes to cover that distance. If you want the instantaneous speed (for situations of variable speed), you need to calculate the distance and time for a fairly short time interval (ideally, the limit, when the time approaches zero).