The speed of a car is 90 km in the first hour and 42 km in the second hour. What is the average speed of the car? Choose the most appropriate option:
A) 89 kmph B) 92 kmph C) 75 kmph D) 65 kmph E) 66 kmph

Rationale: "s = ( 90 + 42 ) / 2 = 66 kmph e"
Answer: E