The distance Train A travels is represented by d = 68t, where d is the distance in kilometers and t is the time in hours. The distance Train B travels at various times is shown in the table. What is the unit rate of each train? Which train is going faster?

Time (hours) Distance (km)
2 150
4 300
5 375


Train A's unit rate is
km per hour.
Train B's unit rate is
km per hour.
Train
(select)
is faster.