In a 100 meter race, A covers the distance in 36 seconds and B in 45 seconds. In this race A beats B by:

In 100100 metres race, A covers the distance in 3636 seconds and B in 4545 seconds. Clearly, A beats B by (45−36)=9(45−36)=9 seconds.Speed of B =10045=10045 m/sDistance covered by B in 99 seconds =10045×9=10045×9 =20=20 metres.