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 in miles per hour, we can use the formula:
Average speed = Total distance / Total time
Given that Chen rode his skateboard 3 3/4 miles in 3/4 of an hour, we first want to convert the mixed number 3 3/4 to an improper fraction. 3 3/4 is equal to (4*3+3)/4 = 15/4 miles.
Now we can plug the values into the formula:
Average speed = 15/4 miles / 3/4 hours
Average speed = 15/4 / 3/4
Average speed = 15/4 * 4/3
Average speed = 15/3
Average speed = 5 miles per hour
Therefore, Chen's average speed on his skateboard is 5 miles per hour.