Jason: 0.5 mile/minute (because k=0.5)
Susan: 0.6 mile/minute (because 3 mile/5 minute)
Mickey: 0.3 mile/minute (because (12 mile-6 mile)/(40 minutes-20 minutes) )
Thus, Mickey had the lowest unit rate, in miles, for one minute traveld, which is 0.3 mile/minute.
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