Point q belongs to side
ab
of square abcd. the distances from point q to the diagonals of the square are 2 ft and 3 ft. find the diagonal of the square.

Lets assume that there are 2 lines from the point Q that are perpendicular to the diagonals of the square ( QM and QN ). 
QM = 2 ft and QN = 3 ft.
Then : QM + QN = d/2 ( d is the diagonal )
2 + 3 = d/2
d = 5 * 2 
d = 10 ft
The diagonal of the square is 10 ft long.

16 minutes is correct

The answer is d 18ft