Constant of variation?
Speed and time are inversely proportional.
The constant of variation is 150.
Given that :
Distance travelled is 150 Km.
Time = distance/ speed
We observe that as the speed reduces the time taken to travel the same distance of 150 Km increases.
Therefore Speed and time are inversely proportional.
So, the proportionality constant ( or constant of variation) is distance = 150 km.