Two circles of radii 10 cm and 5 cm touch each other externally at a point A. PQ is the direct common tangent of those two circles of centres $$O_{1}$$ and $$O_{2}$$. respectively. The length of PQ is equal to:

A

$$10\sqrt{2}$$ cm

B

$$8\sqrt{2}$$ cm

C

$$9\sqrt{2}$$ cm

D

$$6\sqrt{2}$$ cm