Consider a Circle with 100 points numbered 1,2,3,4,…..,99,100. Now their is a tortoise at point numbered 1 and a hare at point numbered 2 and both can only move in clockwise direction only on numbered points. Tortoise can move one point at time for eg :- from 1 to 2,from 2 to 3 and so on and hare can move two points at a time for eg :- from 2 to 4 , from 4 to 6 and so on.They start moving and move at the same time i.e, when tortoise moves from 1 to 2, then hare also moves from 2 to 4. They continue to move like this until they meet at some point. Now find the point at which they meet or if they cannot meet at some point tell why??