Problem:
Casey went on a road trip that covered miles, stopping only for a lunch break along the way. The trip took hours in total and her average speed while driving was miles per hour. In minutes, how long was the lunch break?
Answer Choices:
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B.
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E.
Solution:
Since we know that , we can solve for the amount of time it would take to go at . Suppose it takes a time hours to complete the road trip if Casey doesn't stop: . So if it would take Casey or to drive without stopping, then she must have stopped for if the whole trip took her . Converting to minutes, we get that Casey stopped for or .
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