Explanation:
As the speed increases the time required to travel a distance is lessened.
say you have to go 100 km
if you go 20 km /hr it will take 5 hr....butif you increase your speed
( x axis) to 50 km/ hr it will take less time ....ony 2 hours so the graph A is most representative (look at the positive portion of the graph of
y = 100/x )