Frank reads at least 24 pages but not more than 36 pages of a book. He reads 12 pages per hour. The number of hours Frank reads p pages is modeled by a function. t(p)=p/12

What is the practical range of the function?

All real numbers from 24 to 36, inclusive.
All multiples of 12 between 24 and 36, inclusive.
All real numbers.
All real numbers from 2 to 3, inclusive.