Solve Simplify the Answer $\frac { 5 } { 30 }$

Solve. Simplify the answer.
-Ian walked $\frac { 5 } { 30 }$ of a mile to his biology class, $\frac { 5 } { 30 }$ of a mile to his art class, $\frac { 6 } { 30 }$ of a mile to his calculus class, and then back to his dormitory. If he walked 1 mile altogether, how far did he walk from his calculus class to his dormitory?

A) $\frac { 19 } { 30 } \mathrm { mi }$
B) $\frac { 2 } { 3 } \mathrm { mi }$
C) $\frac { 7 } { 15 } \mathrm { mi }$
D) $\frac { 8 } { 15 } \mathrm { mi }$