A car traveled from San Diego to San Francisco at an average speed of 63 miles per hour. If the journey back took twice as long, what was the average speed of the trip? Choose the most appropriate option:  A) 24.  B) 32.  C) 36.  D) 42.  E) 44.
Let the time taken be = x   One way distance = 63x   Total distance traveled = 2 * 63= 
<gadget id="calculator">2 * 63</gadget>
<output>126</output>
126x   Total time taken= x + 2x = 3x   Average speed = 126x/3x = 42   Answer: 42.126 /3= 
<gadget id="calculator">126 /3</gadget>
<output>42</output>
42   Answer: 42.
<result>D</result>
A car traveled from San Diego to San Francisco at an average speed of 63 miles per hour. If the journey back took twice as long, what was the average speed of the trip?