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Assuming the speed is kept constant from beginning to end of the journey: 5 hours and 36 minutes.

If you allow for acceleration and deceleration at beginning and end, or during, the journey then a number of additional assumptions need to be introduced.

For example, at the beginning, how far and how long does it take to get up to 75 miles per hour? Or, at what rate does the object accelerate and/or decelerate?

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14y ago
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Q: How long will it take to drive 420 miles at 75 miles per hour?
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