Fesdus goes out cycling outdoors. He travels at an average speed of 3km/h, to the top of the hill where the midpoint of the trip is. Going down hill, Juan travels at an average speed of 9km/h. Which of the following is the closest approximation of Fesdus's average speed, in kilometers per hour, for the round trip?  Choose the correct choice from the following answers.
A) 4.2	B) 4.5	C) 7.6	D) 3.6	E) 2.2
Since we're not given a distance to work with, we can TEST any distance that we like. Here, since the speeds are 3 km/hour and 9 km/hour, using a multiple of both 3 and 9 would make the math easiest.   Let's set the Distance up the hill at 36 km.   So, going uphill, we have....   D = (R)(T)   36 = (3)(T)   36/3 = 13 = T   13 hours to go uphill   Going downhill, we have....   D = (R)(T)   36 = (9)(T)   36/9= 
<gadget id="calculator">36/9</gadget>
<output>4</output>
4= T   4 hours to go downhill   Total Distance = 120 km   Total Time = 13+4= 
<gadget id="calculator">13+4</gadget>
<output>17</output>
17 hours   4.2verage Speed= 72/17 = 4.2 km/hour   4.2
<result>A</result>
Fesdus goes out cycling outdoors. He travels at an average speed of 3km/h, to the top of the hill where the midpoint of the trip is. Going down hill, Juan travels at an average speed of 9km/h. Which of the following is the closest approximation of Fesdus's average speed, in kilometers per hour, for the round trip?