Question

Buck drove 220 miles in 5 hours. What was his average rate of speed?

Answer 1

220/5=44km/h because speed = distance/time

Answer 2

let
Total distance = d = 220 miles
Total time = t = 5 hours
Average speed = ?

The required formula to find average rate of speed is 

avg speed = d / t = 220 / 5 

average speed = 44 miles / hour