The speed of a car is 90 km in the first hour and 75 km in the second hour. What is the average speed of the car?
Choose the correct answer.
A) 89 kmph	B) 82.5 kmph	C) 75 kmph	D) 65 kmph	E) 77 kmph

Rationale: "s = ( 90 + 75 ) / 2 = 82.5 kmph b"
Answer: B