Direction Sense Test

Stanley starts cycling from point $A$. He cycles $x$ km towards the West and then turns right and cycles 3 km . He again turns right and cycles for $x+1 \mathrm{~km}$. He again turns right and cycles for $2 x+1 \mathrm{~km}$. He takes a final right turn and cycles for 1 km to stop at point $B$. Point $B$ is 6 km South of point $\boldsymbol{A}$. What is the value of $x$ ?