This is an old question that is no longer in use.
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You increase your speed from 30 km/h to 90 km/h. How is the breaking distance affected?
First calculate how many times higher the speed is:
90 / 30 = 3 times the speed
“The braking distance [...] increases quadratically with increasing speed.” (Driving Licence Book, 19th Edition, page 120)
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