In a triangle $$PQR, PX, QY$$ and $$RZ$$ be altitudes intersecting at $$O$$. If $$PO$$ = 6 cm, $$PX$$ = 8 cm and $$QO$$ = 4 cm, then what is the value (in cm) of $$QY$$?

A

6.3

B

5.8

C

6

D

7