On level farmland, 2 runners leave at the same time from the intersection of 2 country roads. One runner jobs due north at a constant rate of 8 miles per hour while the second runner jogs due east at a constant rate that is 4 miles per hour faster than the first runner's rate. How far apart, to the nearest mile, will they be after 1/2 hours?
A. 6
B. 7
C. 8
D. 12
E. 14
A. 6
B. 7
C. 8
D. 12
E. 14
