a small airplane flies 625 miles with an average speed of 250 mph.. 1.25 hours after the plane leaves a boeing 747 leaves from the same point. both planes arrive at the same time; what was the average speed of the 747?
time for first plane = 625 / 250 = 2.5 hours after 1.25 hours boeing 747 takes 1.25 hours (2.5 - 1.25) to arrive at the same location at the same time so, speed = distance / time = 625 / 1.25 = 500 the average speed of the boeing 747 is 500 mph
