alica finished the race 3.75 seconds before kaye. donna finished the race 5.09 seconds after carmen. carmen finished the race 10 seconds before kaye. ardens finished 4.89 seconds after kaye. how many seconds earlier did carmen finish than anders

see previous post

If your son does not use variables such as x,
you could just pick some arbitrary time, say ...
kaye's time is 50 seconds
and do what I did in the previous post