A runs 1times as fast as B. If A gives B a start of 80 m, how far must the winning post be so that A and B might reach it at the same time?
Answer: Option A
Thus, in race of 5 m, A gains 2 m over B.
2 m are gained by A in a race of 5 m.
Winning post is 200 m away from the starting point.