She is riding the bike at .3 kilometer per minute. All of the tables have 1.5 as the first variable in the y column. To figure out the number of kilometers she travelled in 5 minutes, you have to solve .3x = 1.5. This is equal to 5. Since the number of minutes is doubled from 5 to 10, the answer is also doubled from 1.5 to 3.0
