Solve
-Linda and Dave Leave Simultaneously from the Same Starting $2 \frac { 1 } { 7 } \mathrm { hr }$

Multiple Choice

Solve.
-Linda and Dave leave simultaneously from the same starting point biking in opposite directions. Linda bikes at 5 miles per hour and Dave bikes at 9 miles per hour. How long will it be until they
Are 30 miles apart from each other?

A) $2 \frac { 1 } { 7 } \mathrm { hr }$
B) $7 \frac { 1 } { 2 } \mathrm { hr }$
C) $\frac { 7 } { 15 } \mathrm { hr }$
D) $\frac { 2 } { 3 } \mathrm { hr }$