The average speed of a plane is 560 kilometers per hour. How long does it take the plane to travel 140km?

The average speed of a plane is 560 kilometers per hour. How long does it take the plane to travel 140 kilometers?|||15 minutes|||They will measure how fast an airplane goes with something called knots. It's pretty much nm/h. anyway i live in america, i have no clue how fast a kilometer is. Also I have a question for you, what do you mean by average speed? Because the plane that I fly only goes 120MPH or like 100 Knots or so. The average amount of planes out there are private planes man. Airlines are no where near being an average plane just to let you know.