Check out some div from past races and you'll see the pattern. Its not 100%, but it gives approx. If the 2nd horse doesn't pay evens and pays $1.50 you halve the div. Winner pays 6.00, 2nd pays 2.00. approx quin ( mult by 4, 6x4) 24.00
winner pays 6.00 2nd pays 1.50. approx quin 12.00
winner pays 6.00 2nd pays 3.00 approx div 36.00

winner pays 10.00 2nd pays 2.00 approx div 40.00
winner pays 10.00 2nd pays 1.50 approx div 20.00
winner pays 10.00 2nd pays 3.00 approx div 80.00


check past results, you'll see a pattern. Happy punting