City A to city B, John drove for 1 hour at 40 mph and for 3 hours at 60 mph. What was the average speed for the whole trip?	Choose the correct answer: A) 57 B) 57.5 C) 58.2 D) 59 E) 55

Rationale: the total distance is 1 × 40 + 3 × 60 = 220 and the total time is 4 hours . hence , average speed = ( total distance / total time ) = 220 / 4 = 55 answer : e
Answer: E