In the first hour of a two-hour trip, a car traveled d kilometers, and in the second hour of the trip, the car traveled a quarter that distance. What is the average rate at which the car traveled during the trip, in kilometers per hour? Pick one
A) d	B) 1/3*d	C) 1/2*d	D) 5/8*d	E) 3/2*d
Solution:   Lets look at the information given in the question...   Total time travelled = 2 hrs   Distance travelled first hour = d   Distance travelled second hour = d/4   The question is asking for the avg speed at which the car travels for 2 hrs   We know that avg speed = total distance/total time   Lets place the information given in the question to the formula above = (d+d/4)/2   = 5/8*d   We find that option D is the answer as it gives the same expression as found in our calculation above. Answer option 5/8*d.
<result>D</result>
In the first hour of a two-hour trip, a car traveled d kilometers, and in the second hour of the trip, the car traveled a quarter that distance. What is the average rate at which the car traveled during the trip, in kilometers per hour?