You can put this solution on YOUR website! How far will you go doing 80 mph in 21 minutes?
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Start by representing 21 minutes as hours:
21/60 hours
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then, apply the distance formula:
d = rt
d = 80(21/60)
d = 8(21/6)
d = 4(21/3)
d = 4(7)
d = 28 miles