Over 100 m, Mahi can beat Neel by 10 m and Ojas by 13 m. Neel and Ojas race 180 m. By how many metres does Neel win?

Neel runs 90 m while Ojas runs 87 m, so Ojas's speed is $\frac{87}{90}$ of Neel's. Over 180 m Ojas covers 174 m: Neel wins by 6 m. (5.4 m scales the 3 m gap by 1.8 instead of 2.)