TOM traveled the entire 60 miles trip. If he did the first 15 miles of at a constant rate 24 miles per hour and the remaining trip of at a constant rate 45 miles per hour, what is the his average speed, in miles per hour?	Pick one
A) 35.62 mph  B) 25.45 mph  C) 34.52 mph  D) 36.92 mph  E) 36.29 mph

Rationale: avg speed = total distance / total time = ( d 1 + d 2 ) / ( t 1 + t 2 ) = ( 15 + 45 ) / ( ( 15 / 24 ) + ( 45 / 45 ) ) = 60 * 2 / 3 = 36.92 mph d
Answer: D