Distance = 250 miles, time spent = 4.5 hours
AVERAGE SPEED = DISTANCE/TIME
So AVERAGE SPEED =250/4.5 = 55.55 mi/h. The closest is 56 mi/h
The first one might be cannot be determined
2- rational
3- irrational
The irrigation arm is 300 ft. 300 ft is just the radius. The diameter is 600, because to get the diameter you must multiply the radius by two. So 600 is the land the irrigation arm covers.
