The speed of the airplane that traveled this distance in that timespan is 500 miles per hour.
Speed is the ratio of distance travelled to the time taken to reach the distance. It is given by:
Speed = distance / time
Given that the distance is 3000 miles, the time is from 7:00 am until 1:00 pm which is 6 hours, hence:
Speed = distance / time
Speed = 3000 miles / 6 hours = 500 miles per hour
The speed of the airplane that traveled this distance in that timespan is 500 miles per hour.
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