Janis and Susan Are 15 Miles Apart and Are Riding $\frac { 5 } { 3 }$

Multiple Choice

Janis and Susan are 15 miles apart and are riding bicycles toward each other. If Janis rides at 5 mph and Susan at 4 mph, how long will it take for them to meet each other?

A) $\frac { 5 } { 3 }$ hour
B) $\frac { 3 } { 5 }$ hour
C) 3 hours
D) $\frac { 4 } { 9 }$ hours