D=RT
D is distance, r is rate (speed) and t is time.
Convert Knots to mph or km/h.
1 knot = 1.151 mph so 20 knots = 20*1.151=23.82 mph.
Convert minutes to hours, because the speed is given in mph (after the conversion.)
60 minutes/hour so divide 6 min by 60 to find the hours.
6/60=.1
D=23.83*.1=2.383 miles.
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