Steve traveled the first 5 hours of his journey at 40 mph and the last 3 hours of his journey at 80 mph. What is his average speed of travel for the entire journey?
Choose the most appropriate option
A) 53.33 mph B) 88 mph C) 60 mph D) 64 mph E) 66.67 mph

Rationale: average speed = total distance / total time = ( 40 * 5 + 80 * 3 ) / ( 5 + 3 ) = 440 / 5 = 88 answer : b
Answer: B