The speed of sound of the harrier is the same as the speed of sound of any other object in the relevant medium. It is approx 1225 km/hour.
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The speed appears to be 400 miles an hour. If you meant 400 miles, the speed is 50 miles an hour.
That speed is described as "fifty miles per hour".
Her speed was 50 miles per hour.
How many miles will you travel in an hour at that constant speed? 60/4=15 miles per hour
Average speed is usually a unit rate. So, if you travel 350 miles in 1 hour then that is said"350 miles per hour."