A plane travels 1400 miles during 2 1/2-hour flight
how many miles per hour, on average, does the plane travel
To find the average speed, we need to divide the total distance traveled by the total time taken.
The total distance traveled is 1400 miles.
The total time taken is 2 1/2 hours, which can be written as 2.5 hours.
So, the average speed of the plane is 1400 miles / 2.5 hours = <<1400/2.5=560>>560 miles per hour.