The speed of a car is 100 km in the first hour and 80 km in the second hour. What is the average speed of the car?	Choose the correct choice from the following answers.
A) 12  B) 75  C) 88  D) 54  E) 90
S = (100 + 80)/2= 
<gadget id="calculator">(100 + 80)/2</gadget>
<output>90</output>
90 kmph   Answer: 90
<result>E</result>
The speed of a car is 100 km in the first hour and 80 km in the second hour. What is the average speed of the car?