12.41 mph
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1 mile/50 sec * 3600 sec/hr = 72 mph
1 mi / 55 MPH = 0.018 hr * 60 min / 1 hr = 1.09 min * 60 sec / 1 min = 1 min 5.5 sec
60 sec = 1 minute 60 min = 1 hour 3600 sec = 1 hour one mile/sec = 3600 mph - pretty fast!
This would be an average speed of 8.1 miles per hour.
1 mi / 45 MPH * 60 min/hr * 60 sec/min = 80 seconds.