Question 240575
To convert minutes to hours, we can use a convertion factor of 60 minutes per 1 hour in order tocancel out the unit of measure (minutes).  
So, our mathematical equation would read like this:
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(3 miles / 45 minutes) x (60 minutes / 1 hour)
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or...
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{{{(3/45)*(60/1)=x)}}}
{{{4=x}}}
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Your response is 4 miles per hour.
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Another way of doing it is to divide 45 by 3, which gives us 1 mile per 15 minutes.  Since we know 60 minutes is 1 hour and 1 hour has 4 times 15 minutes, we arrive to the same conclusion... 4 miles per hour.
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