Q: How long to complete 30 mile race if average speed is 20 mph?

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A 4-minute mile means an average speed of 15 miles per hour.

This is an average speed of 4.3 miles per hour.

That cannot be calculated without knowing the average speed over that distance.

60 mile/h

11 hours without stopping.

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How long does it take a car to travel 1 mile if its average speed is 40 mph? In: http://wiki.answers.com/Q/FAQ/4423 [Edit categories]

You will have to maintain an average speed of 4.5 mph

A 4-minute mile means an average speed of 15 miles per hour.

This is an average speed of 4.3 miles per hour.

If it takes 4 minutes to run 1 mile then in 15 times as long (1 hour) you would run 15 miles. So the average speed must be 15 miles per hour.

Average speed is about 6 mph.

Time = Distance/Speed = 1 mile/70 mph = 1/70 hours = 0.857 minutes (approx).

11 hours

That cannot be calculated without knowing the average speed over that distance.

You can drive a mile at any speed, as long as you have enough time to do so.

470 / 45 = 10.444r hours.

640 revolutions completed the on-screen track which takes about 15 minutes at an average speed, so I would assume that the complete track represents a mile.