the second you hit equal lol
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It depends on your average speed. If the roads permit an average speed of 60mph, it would take you 5 hours. To work it out (using T=D/S): Time (hours) = 300 miles divided by average speed (mph)
Average speed is an average value of speed over a given time. If your speed is constant (not changing), then your average speed will equal your speed at any given moment in time.
If you don't know them, use a calculator, though on tests and such, doing in your head is much faster than using a calculator. However, I would recommend knowing up to 11 or 12, for speed and just general knowledge.
How about using a calculator!
average speed = distance / time