SOLUTION: Please help! susan left her home at 7:00 am, driving her car at a rate of 45 mph. at 9:00 am her sister marion drove after her along the same highway traveling at the rate of 60 m

Question 517969: Please help!
susan left her home at 7:00 am, driving her car at a rate of 45 mph. at 9:00 am her sister marion drove after her along the same highway traveling at the rate of 60 mph. in how many hours did marion pass susan?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
How much of a head start in miles did Susan get?
( from 7 to 9 is 2 hours )
mi
Start a stopwatch when Marion leaves.
Now they each will travel different distances
for the same amount of time.
Let = the distance that Marion travels
----------
Susan's equation:
(1)
Marion's equation:
(2)
Substitute (2) into (1)
(1)
(1)
(1)
Marion will pass Susan in 6 hours
check:
(2)
(2)
(2)
and
(1)
(1)
(1)
(1)
OK
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