VTMO 2021 — Grade 2 — titan-cup Question 12

On the rectangle An travels $S$→$A = 1$→$A = 2$→$F$ and Binh $S$→$B = 1$→$B = 2$→$F$. $SA = 1 = 60 m , SB = 1 = 100 m$, and An travels $10 m$ farther. How much does $A = 2 F$ exceed $B = 2 F$?