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Driving along a crowded freeway, you notice that it takes a time t to go from...

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 8.3 mi/h , the time to go one mile decreases by 15 s.

What was your original speed?

Express your answer using two significant figures.

Please Explain.

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