Jennifer and Alice are 4 miles apart. If Jennifer starts walking toward ... ...

Jennifer and Alice are 4 miles apart. If Jennifer starts walking toward Alice at 3 miles per hour and at the same time Alice starts walking toward Jennifer at 2 miles per hour, how much time will pass before they meet?
(A) 20 minutes
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Nova Math - Problem Set V: Word Problems