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The answer depends on whether the rate of acceleration is uniform. There is no indication in the question that it is.

Q: What is the average speed of a car that speeds up from 60 miles per hour to 70 miles per hour in 8 seconds?

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1800mph

The average speed is 120 miles per hour.

400 meters in 43.18 seconds equates to an average speed of 20.72 miles per hour.

To join the army, two miles must be done in 15 minutes and 53 seconds, so average is somewhere around there.

Their average walking speed is 2.75 mph.

Related questions

100 miles/50 seconds= 2 miles per second average speed

The average speed is 1,800 mph

Your average speed is 18.67 miles per hour.

1800mph

The average speed is 120 miles per hour.

The average speed over the first 30 miles is equal to the average speed over the next 15 miles. You cannot guarantee that the speed was constant inbetween, though. The average speeds are 45 MPH for each leg.

3.47 miles in 22 minutes and 56 seconds equates to an average speed of 9.08 miles per hour.

The average speed is 1.023 miles per hour.

20+ miles an hour. Speed skaters can reach speeds up to 30+ miles an hour.

1800 miles per hour

3.1064 miles in 22 minutes 55 seconds equates to an average speed of 8.13 miles per hour.

The average speed was 6.433 mph.