50mph is equivalent to 80km/h
use the formula s=d÷t (s=speed d=distance t=time)
to find distance u must know this formula breaking distance = b=0.7s+80x80/ 254f
{80x80 = 80 squared }
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1 mile
0.41 seconds.
169/50 = 3hours 22minutes 48seconds
3.852 seconds at 50 mph
35 minutes