A and B run a 5 km race on a round course of 400 m. If their

A and B run a 5 km race on a round course of 400 m. If their speed are in the ratio 5 : 4, the
number of times, the winner passes the other, is

The winner will pass the other, one time in covering 1600m.
Hence, the winner will pass the other 3 times in completing 5km race.