Carcass wrote:
Waugh jogged to a restaurant at x miles per hour, and jogged back home along the same route at y miles per hour. He took 30 minutes for the whole trip. If the restaurant is 2 miles from home, what is the average speed in miles per hour at which he jogged for the whole trip?
(A) 0.13
(B) 0.5
(C) 2
(D) 4
(E) 8
Distance = 2 miles
Total time = 30 min = 1/2 hr
=> Average speed = total distance / total time = (2+2)/(1/2) = 8 miles per hour
(Note: x and y are not necessary)
Answer E