It takes Joey the postman 1 hours to run a 1 mile long route every day. He delivers packages and then returns to the post office along the same path. If the average speed of the round trip is 5 mile/hour, what is the speed with which Joey returns?  Choose the correct choice from the following answers:
A) 1.67
B) 12
C) 13
D) 14
E) 15
let his speed for one half of the journey be 3 miles an hour   let the other half be x miles an hour   now,   avg speed =5 mile an hour   2*1*x/1+x=5   2x=5x+5=&gt;3x=5=5/3=1.67   1.67
<result>A</result>
It takes Joey the postman 1 hours to run a 1 mile long route every day. He delivers packages and then returns to the post office along the same path. If the average speed of the round trip is 5 mile/hour, what is the speed with which Joey returns?