The Course of a Yachting Race Is in the Shape $3 \frac { 7 } { 12 }$

Multiple Choice

The course of a yachting race is in the shape of a triangle with sides that measure $3 \frac { 7 } { 12 }$ miles, $4 \frac { 7 } { 10 }$ miles, and $2 \frac { 7 } { 8 }$ miles. Find the total length of the course.

A) $13 \frac { 19 } { 120 }$ miles
B) $11 \frac { 19 } { 120 }$ miles
C) $11 \frac { 19 } { 240 }$ miles
D) $13 \frac { 19 } { 240 }$ miles
E) $10 \frac { 19 } { 240 }$ miles