Aaron will jog from home at 2 miles per hour and then walk back home by the same route at 4miles per hour. How many miles from home can Aaron jog so that he spends a total of 3 hours jogging and walking?  Select:
A) 5
B) 7
C) 3
D) 9
E) 10

Rationale: xyt / ( x + y ) x = 2 , y = 4 t = 3 2 * 4 * 3 / 2 + 4 = 18 / 6 = 3 answer : c
Answer: C