Puzzle-8

Jack and Jill were racing, but it was no contest.
Jack beat Jill by 10 yards on a 100-yard course.
Jill suggested that for the second race, Jack should start 10 yards behind the start­ing line-she figured that would give her a fair chance, since he had won by 10 yards.
Who won, and by how much yards..?































































ANSWER :

Jack won by one yard. He can run 100 yards while Jull can run 90, so with 10 yards left, the two of then tied.