Use the conversion ratio of 1 kilometer equals about 0.62 miles to solve the following problem. An airplane was about 900 kilometers per hour. What is the airplane speed in miles per hour?
To convert kilometers to miles, we can multiply the number of kilometers by the conversion ratio: 900 km * 0.62 miles/km = <<900*0.62=558>>558 miles.
Therefore, the airplane speed is 558 miles per hour.