Solve the given problems. All numbers are accurate to at least two significant digits.

For an optical lens, the sum of the reciprocals of p, the distance of the object from the lens, and q, the distance of the image from the lens, equals the reciprocal of f, the focal length of the lens. If p is 5.0 cm greater than q (q > 0) and f = 4.0 cm, find p and q.