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23bennabbe
140 miles you have to divided 28 by 12 and you get 2.333333333 then you times that by 60 because their is 60 mins in one hour
kanokiseki
There are 60 minutes in 1 hour. You want to convert minutes to an hour by multiplying 60 minutes per hour and that will give you the answer:

(28miles)/(12minutes) * (60minutes/1hour)
The minutes will cancel out so you are left with miles/hour

Answer: 140 miles/hr

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