(a) Find the ratio of each distance given in the table to the corresponding time. If the ratio gives a constant value, then the train travelled same distance each minute.
The ratio is a constant. Hence the train appears to go the same distance each minute.
Distance traveled in one minute = 6 km
Predicted distance traveled in 9 minutes
(b) Find the ratio of cost to the corresponding size of people. If the ratio gives a constant value, then the cost for each person appears to be same.
Here, the ratio is not a constant value. Hence the cost for each person is not always the same.