In a car race, one thing is certain, there will be losers and winner. For sure, every car participants wouldn't want to lose. The loser will get no cash and they can't buy some new parts for their car or even some food to feed their families. Winners get the cash in every race.
Like in any car game, you need to drive your car as fast as you can. Make sure that you won't hit any vehicle or anything since that will slow you down. At the end of the race, you would get some prize money. You can use that to buy some upgrades for your car.