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13 minutes is 13/60 of one hour.
There are 60 minutes in one hour, so 1 hour and 13 minutes is 73/60. It can also be written as 1 13/60.
One third of an hour is 20 minutes.
1 hour = 60 minutes 13 hours = 780 minutes.
distance = rate * time 1.5 mi = r * 13 minutes r = 1.5/13 mi/minute * 60 minutes/hour = 90/13 mph ~= 6.923 mph