Question 407157
k = j/2,
c = 4k,
k + c + j = 476.

From the 1st equation, j = 2k. Substituting this and the 2nd equation into the 3rd equation, we get k + 4k + 2k = 476.
==> 7k = 476, or k = 68 miles driven by kyle,
j = 2*68 = 136 miles driven by jamaal, and 
c = 4*68 = 272 miles driven by connor.