Question 477435
Use the equation:
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Distance = Speed * Time
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Solve for Speed by dividing both sides of this equation by Time to get:
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Speed = Distance/Time
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Now substitute the distance you biked (12 miles) by the Time (1 hour) to get:
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Speed = 12 miles/1 hour = 12 miles per hour.
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That's the answer, but keep in mind that this is your average speed. At some points in your ride you might have gone faster and at other points you may have gone slower.  However, this is the average speed you traveled in the hour.
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Hope this helps you understand the problem.