SOLUTION: Dr. W jogs east at 5.5mph. Thirty minutes later (1/2 hr), Mrs. Dr.W jogs west at 7.25mph. When will they be 25 miles apart?

Algebra ->  Coordinate Systems and Linear Equations  -> Lessons -> SOLUTION: Dr. W jogs east at 5.5mph. Thirty minutes later (1/2 hr), Mrs. Dr.W jogs west at 7.25mph. When will they be 25 miles apart?      Log On


   

Question 382714: Dr. W jogs east at 5.5mph. Thirty minutes later (1/2 hr), Mrs. Dr.W jogs west at 7.25mph. When will they be 25 miles apart?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
W jogs east at 5.5mph.
Thirty minutes later (1/2 hr), Mrs. Dr.W jogs west at 7.25mph.
When will they be 25 miles apart?
:
Let t = Mrs jogging time
then
(t+.5) = W's jogging time
:
Write a distance equation: dist = speed * time
7.25t + 5.5(t+.5) = 25
7.25t + 5.5t + 2.75 = 25
12.75t = 25 - 2.75
12.75t = 22.25
t = 22.25%2F12.75
t = 1.745 hrs (after Mrs starts jogging