Hey there! I'm happy to help!
If the model airplanes flies 22 feet in 2 seconds, it travels 11 feet in 1 second.
There are 60 seconds in one minute. We multiply 11 by 60, giving 660 feet in 1 minute.
There are 60 minutes in one hour. We multiply 660 by 60, giving us 39600 feet in 1 hour.
There are 5280 feet in a mile. To find our speed in mph, we divide 39600 by 5280, giving us 7.5 mph.
Have a wonderful day! :D
