Solve
-Barat Walked $\frac { 1 } { 24 }$ Mile to His Biology Class

Solve.
-Barat walked $\frac { 1 } { 24 }$ mile to his biology class, $\frac { 3 } { 24 }$ mile to his art class, $\frac { 4 } { 24 }$ 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) $\frac { 5 } { 6 } \mathrm { mi }$
B) $\frac { 19 } { 24 } \mathrm { mi }$
C) $\frac { 1 } { 3 } \mathrm { mi }$
D) $\frac { 2 } { 3 } \mathrm { mi }$