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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 X: Word Problems

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Jennifer and Alice are 4 miles apart. If Jennifer starts walking toward ... ... 
Posted: 08/02/2013 15:10
Or
Both of them walk for 4 miles as a TOTAL till they met,
Since D = R x T
2*t + 3*t = 4
5t = 4
T = 4/5 hour
T = 4/5 x 60 minute
T = 48 minute
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