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? Select:	A) 15 kmph	B) 18 kmph	C) 19 kmph	D) 12 kmph	E) 11 kmph
S = (90 + 60)/2= 
<gadget id="calculator">(90 + 60)/2</gadget>
<output>75</output>
75 kmph   Answer:18 kmph
<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?