The average rate during those 4 hours is 83.5 km per hour.
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Distance = Rate * Time or, for our purposes, Rate = Distance/Time Rate = 200 miles/4 hours = 50 miles per hour ==============
28/4 = 7 per hour.
40 mph
Well, honey, if you drove 220 miles in 4 hours, the rate would be 55 miles per hour. It's simple math, darling. Just divide the total distance by the total time and there you have it. Keep on truckin', speed racer!
The unit rate is a comparison of two different quantities with one of the quantities having a value of 1. In this case, the unit rate of 12 miles in 3 hours would be 4 miles per hour. This means that for every 1 hour of time, the distance traveled would be 4 miles.