I'll explain.
So to find the distance you have to subtract 121 by 88 and when you do you get 33.
The time it takes is 30 min then we convert it since we are looking for the mph ( miles per hour) and we would get 0.5.
And the last step is dividing the distance by the time.
33 / 0.5 = 66
That how you get your answer.
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