In the given figure, PQRS is a square of side 20 cm and SR is extended to point T. If the length of QT is 25 cm, then what is the distance (in cm) between the centres $$O_1$$ and $$O_2$$ of the two circles?

A

$$5\surd10$$

B

$$4\surd10$$

C

$$8\surd5$$

D

$$16\surd2$$