On level farmland, two runners leave at the same time from the intersection of two country roads. One runner jogs 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 1/2hour?
(A) 6
(B) 7
(C) 8
(D) 12
(E) 14
(A) 6
(B) 7
(C) 8
(D) 12
(E) 14
