Question 611244: Mary and Kat drove towards each other in a straight line. Mary drove 65 miles per hour, Kat left one hour later and drove 75 miles per hour. If Mary drove 25 miles more that Kat, how long did each drive? What was the total distance they drove?
Answer by ankor@dixie-net.com(22740)   (Show Source):
You can put this solution on YOUR website! Mary and Kat drove towards each other in a straight line.
Mary drove 65 miles per hour, Kat left one hour later and drove 75 miles per hour.
If Mary drove 25 miles more that Kat, how long did each drive?
let t = travel time of K
then
(t+1) = travel time of M
:
Write a distance equation, dist = speed * time
:
M's dist = K's dist + 25 mi
65(t+1) = 75t + 25
65t + 65 = 75t + 25
65 - 25 = 75t - 65t
40 = 10t
t = 4 hrs was K's travel time
then obviously, 5 hrs was M's travel time
:
What was the total distance they drove?
65 * 5 = 325 mi
75 * 4 = 300 mi
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total: = 625 mi
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