Question 7354
John is traveling to a meeting that is 28 miles away. He needs to be there in
30 minutes. How fast does he need to go to make it to the meeting on time? 
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Learn these three equivalent equations:
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DISTANCE = RATE × TIME
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RATE = DISTANCE/TIME
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TIME = DISTANCE/RATE
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You are asked "how fast".  That's asking for a RATE, so use the
middle one above.
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RATE = DISTANCE/TIME
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The distance =  28 miles and the time = 30 minutes or .5 hour.
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RATE = 28 miles/(.5 hour) = 28/(.5) miles/hour = 56 miles/hour.
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Edwin