In 100 m race, A covers the distance in 36 seconds and B in 45 seconds. In this race A beats B by:
20 m
25 m
22.5 m
9 m
Explanation:
Distance covered by B in 9 sec. =$ \left(\dfrac{100}{45} \times 9\right) $m= 20 m.
$\therefore$ A beats B by 20 metres.