The speed of a car is 65 km in the first hour and 45 km in the second hour. What is the average speed of the car? Choose the correct choice
A) 72 kmph  B) 55 kmph  C) 50 kmph  D) 80 kmph  E) 82 kmph

Rationale: "s = ( 65 + 45 ) / 2 = 55 kmph answer : b"
Answer: B