Question 6
An takes $S$→A $_{1}$→A $_{2}$→A $_{3}$→A $_{4}$→A $_{5}$→A $_{6}$→A $_{7}$→A $_{8}$→A $_{9}$→$F$; Binh takes $S$→$B _{1}$→$B _{2}$→$F$. Equal route lengths, $SA _{1} 30 m , SB _{1} 50 m$, as shown. Find A $_{2}$ A $_{3}$+A $_{4}$ A $_{5}$+A $_{6}$ A $_{7}$.
