Fatima is walking home from her city high school. Her average speed is 2 blocks per minute, and her school is 15 blocks from her home. Let m represent the number of minutes since Fatima left her school, and let b represent the number of blocks between her and her home.
Which two of the following equations correctly model Fatima's walk home from school?
Ob= 2m - 15
Ob= 15 - 2m
2m = b - 15
2m - b = 15
2m + b = 15