JEE Math Practice Question

Let R be the point (3, 7) and let P and Q be two points on the line x + y = 5 such that PQR is an equilateral triangle. Then the area of $$\Delta$$PQR is :

1. A.$${{25} \over {4\sqrt 3 }}$$
2. B.$${{25\sqrt 3 } \over 2}$$
3. C.$${{25} \over {\sqrt 3 }}$$
4. D.$${{25} \over {2\sqrt 3 }}$$