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Physics - Speed and Direction

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Driving along a crowded freeway, you notice that it takes a time t to go from one mile marker to the next. When you increase your speed by 4.0 mi/h, the time to go one mile decreases by 12 s. What was your original speed?
....... mi/h ?

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Let the original speed be x mi/h

Original time = distance/original speed = 1/x hours

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