When y is zero, the springs are each stretched a distance δ. Determine the distance y if

Question:

When y is zero, the springs are each stretched a distance δ. Determine the distance y if a force F is applied to points A and B as shown. The ends of cords CAD and CBD are attached to rings at C and D.

Given:
δ = 1.5 ft
k = 40 lb/ft
d = 2 ft
F = 60 lb