The speed of a car is 90 km in the first hour and 60 km in the second hour. What is the average speed of the car?  Choose one:
A) 12  B) 75  C) 88  D) 54  E) 15
S = (90 + 60)/2= 
<gadget id="calculator">(90 + 60)/2</gadget>
<output>75</output>
75 kmph   Answer: 75
<result>B</result>
The speed of a car is 90 km in the first hour and 60 km in the second hour. What is the average speed of the car?