Rewards can be seen in the game.
Racetips are here.
To get any reward you have to finish lap 4 to qualify.
If you win and reach lap 15 you will still only get one heroic dragon when the race ends.
Timelimited laps and spreadsheets will be added later.
Lap 5 > 6: 20k Food x10 (8hrs)
Lap 7 > 8: 50k Food x8 (9hrs)
Lap 10 > 11: 100 Random Tokens x10 (9hrs)
Lap 12 > 13: 100k Food x8 (10hrs)
Lap 15 > 16: 100 Tokens of each element x2 (10hrs)
Lap 18 > 19: 200 Random Tokens x8 (11hrs)
Lap 25 > 26: 100 Tokens of each element x5 (12hrs)
Lap 30 > 31: 2m Food x3 (12hrs)
Lap 34 > 35: 2m Food x5 (13hrs)
Lap 36 > 37: 4m Food x3 (13hrs)
Lap 40 > 41: 4m Food x5 (14hrs)
Lap 42 > 43: 4m Food x6 (14hrs)
For getting orbs in the crew members quests check this thread.