The speed of a car is 70 km in the first hour and 90 km in the second hour. What is the average speed of the car?
Select the correct option:
A) 79 kmph
B) 80 kmph
C) 34 kmph
D) 23 kmph
E) 14 kmph
S = (70 + 90)/2= 
<gadget id="calculator">(70 + 90)/2</gadget>
<output>80</output>
80 kmph   Answer:80 kmph
<result>B</result>
The speed of a car is 70 km in the first hour and 90 km in the second hour. What is the average speed of the car?