Turn 12/5 into a mixed fraction

How can you tell when x and y are not directly proportional?

If there are 3.281 feet in 1 meter, how many inches are in one centimeter

The map shows the location of the airport and a warehouse in a city. though not displayed on the map, there is also a factory 112 miles due north of the warehouse. a truck traveled from the warehouse to the airport and then to the factory. what is the total number of miles the truck traveled?