To find the average speed, we need to find his speed during 3/4 of the trip and then the 52.5 miles. So you know that 52.5 is 1/4 of his total trip. That means if we multiply that by 3, that's how many miles he traveled in 2.5hrs. (157.5) To calculate speed, divide distance by time. For 3/4 of his trip (157.5), it took him 2.5 hours. 157.5/2.5 = 63mph For the remaining 52.5 miles, it took him an hour. 52.5/1 = 52.5mph Now average those two speeds to get the average speed for the whole trip. (63+52.5)/2= 57.6mph
