A car traveled from San Diego to San Francisco at an average speed of 51 miles per hour. If the journey back took twice as long, what was the average speed of the trip?  Answers.
A) 24. B) 34. C) 36. D) 42. E) 44.
Let the time taken be = x   One way distance = 51x   Total distance traveled = 2 * 51= 
<gadget id="calculator">2 * 51</gadget>
<output>102</output>
102x   Total time taken= x + 2x = 3x   Average speed = 102x/3x = 34   Answer: 34.102 /3= 
<gadget id="calculator">102 /3</gadget>
<output>34</output>
34   Answer: 34.
<result>B</result>
A car traveled from San Diego to San Francisco at an average speed of 51 miles per hour. If the journey back took twice as long, what was the average speed of the trip?