A9. When Cene runs $1000 \mathrm{~m}$, Tone is $10 \mathrm{~m}$ behind him. When Tone runs $1000 \mathrm{~m}$, Milan is $20 \mathrm{~m}$ behind him. By how many meters will Cene outpace Milan in a $1000 \mathrm{~m}$ race?
(A) 30.1
(B) 30
(C) 10
(D) 29.8
(E) It is impossible to determine.
A9. When Ko Cene runs $1000 \mathrm{~m}$, Tonet is $10 \mathrm{~m}$ short of the finish line. Milan is somewhat slower than Tonet, as he gradually falls behind from the start: when Tonet runs $1000 \mathrm{~m}$, Milan is $20 \mathrm{~m}$ behind him. Therefore, when Tonet runs $990 \mathrm{~m}$, Milan is $\frac{990.20}{1000}=\frac{99}{5}=19.8 \mathrm{~m}$ behind Tonet. Cene thus outpaces Milan by $10+19.8=29.8 \mathrm{~m}$.