Answer:4.5mile per hour
Explanation:
Mike runs at 6 miles per hour.
Time = distance / speed = 3 miles / 6 miles per hour = 0.5hour,
To minutes =30 minutes.
Carl runs the race in 30 + 10minutes = 40 minutes. Converting this to hours gives us 0.666 hours.
Speed = distance / time
=3miles/ 0.666 hours = 4.50 miles per hour.