The speed of a car is 140 km in the first hour and 40 km in the second hour. What is the average speed of the car? Choose the correct option:
A) 72 kmph B) 75 kmph C) 30 kmph D) 90 kmph E) 82 kmph
S = (140 + 40)/2= 
<gadget id="calculator">(140 + 40)/2</gadget>
<output>90</output>
90 kmph   ANSWER:90 kmph
<result>D</result>
The speed of a car is 140 km in the first hour and 40 km in the second hour. What is the average speed of the car?