Chen rode his skateboard 3 3/4 miles in 3/4 of an hour What was his average speed in miles per hour
To find Chen's average speed, we need to divide the total distance he rode by the total time it took him to ride that distance.
Total distance = 3 3/4 miles = 15/4 miles
Total time = 3/4 hour
Average speed = Total distance / Total time
Average speed = (15/4) / (3/4)
Average speed = 15 / 3
Average speed = 5 miles per hour
Therefore, Chen's average speed was 5 miles per hour.