SOLUTION: Mary walks at 4 mph. sarah jogos 10 mph. if they both leave the school at 8 am going along the same path in the same direction, at what time will they be 9 miles apart?

Question 737631: Mary walks at 4 mph. sarah jogos 10 mph. if they both leave the school at 8 am going along the same path in the same direction, at what time will they be 9 miles apart?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = Sarah's distance when they are 9 mi apart
= Mary's distance when they are 9 mi apart
Let = time in hrs passed after 8 AM when they are 9 mi apart
-------------
Sarah's equation:
(1)
Mary's equation:
(2)
------------
(2)
By substitution:
(2)
(2)
(2) '
8 AM + 3/2 hrs = 9:30 AM
check:
(1)
(1)
and
(2)
(2)
(2)
OK

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