Respuesta :

Answer: 5.25 miles per hour.

Step-by-step explanation:

21/4 = 5.25

TheBlueFox

Hello There!

WHAT WE KNOW Shelly biked 21 miles in 4 hours. We know that Shelly's average speed = 5.25 miles / hour because "21 divided by 4 equals 5.25"

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