Edward traveled the entire 60 miles trip. If he did the first 3 miles of at a constant rate 24 miles per hour and the remaining trip of at a constant rate 48 miles per hour, what is the his average speed, in miles per hour? Answers:
A) 20mph	B) 24mph	C) 30mph	D) 32mph	E) 53mph
Average speed=sum of distance/sum of time. If he travelled the first 3 miles at 24 miles/hr, it would take 0.125 hr. For the remaining trip, if he went at 48 miles/1hr, it would take 1 hour. Then, the average speed is 60miles/(0.125+1)hrs=53miles/1hr.   Therefore, the answer is 53mph.
<result>E</result>
Edward traveled the entire 60 miles trip. If he did the first 3 miles of at a constant rate 24 miles per hour and the remaining trip of at a constant rate 48 miles per hour, what is the his average speed, in miles per hour?