The unit rate is how far something moves in ONE second. So in this case you divide by 28 (the number of seconds).
12/28=0.4285714285714286 meters a second.
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12 meters in 28 seconds = 12/28 or 0.428 meters per second
1 meter in 2 and 1/3 seconds
If 12 are 1.29, then the rate for 1 (a unit) is 0.1075(1.29/12)
300 miles per hour ==> 1 mile every 12 seconds
it is a unit rate