Answer:
2 5/8 hours
Explanation:
Distance = 5 1/4 = 21 / 4 miles 
Miles per hour = 2 miles per hour 
Miles per hour = Distance / Time 
Time = Distance / Miles per hour 
Time = (21 / 4) miles / 2 miles per hour = 2.625 hours 
or 2 hours 37 minutes and 30 seconds 
or 2 5/8 hours