The speed of a car is 85 km in the first hour and 45 km in the second hour. What is the average speed of the car? Pick:  A) 72 kmph  B) 65 kmph  C) 30 kmph  D) 80 kmph  E) 82 kmph

Rationale: s = ( 85 + 45 ) / 2 = 65 kmph answer : b
Answer: B