121- 88 = 33 miles traversed in 30 minutes.
d = r*t
33 = r* (.5 hr)
Solve for r.
Average speed will be in miles per hour.
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8 - 3 = 5 Slope formula numerator
2 - 0 = 2 Slope formula denominator
5/2 = 2.5
18, you do 63/3.5 to get how many for 1 minute