Chen rode his skateboard 3 3/4 miles in 3/4 of an hour. What was his average speed in miles per hour?

Answer 1

To find Chen's average speed in miles per hour, we need to divide the total distance he traveled by the total time it took him.

Chen traveled 3 3/4 miles in 3/4 of an hour. To express the mixed number 3 3/4 as an improper fraction, we multiply the whole number (3) by the denominator (4) and add the numerator (3):

3 3/4 = (3 * 4) + 3 = 12 + 3 = 15/4

So, Chen traveled 15/4 miles in 3/4 of an hour.

To find his average speed, we divide the total distance by the total time:

Average speed = Total distance / Total time
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 was 5 miles per hour.