Douglas has a segment with endpoints I(5,2) and J(9,10) that is divided by a point K such that IK and KJ form a 2:3 ratio. He knows that the distance between the x-coordinates is 4 units. Which of the following fractions will let him find the x-coordinate for point K?
a. 2 over 3
b. 2 over 5
c. 3 over 2
d. 3 over 5