SOLUTION: Pa got in his '29 Ford and started driving west from Jackson at a constant speed of 30 miles per hour. An hour later Ma got in her '31 Buick and started driving west from Jackson a

Question 939447: Pa got in his '29 Ford and started driving west from Jackson at a constant speed of 30 miles per hour. An hour later Ma got in her '31 Buick and started driving west from Jackson at a constant speed. After driving 4 hours Ma had passed Pa and was 10 miles ahead of him. How fast was Ma going?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Pa's head start was mi
Start a stop watch when Ma leaves
Let = the distance Ma travels
in hrs
Let = Ma's rate in mi/hr
--------------------
Pa's equation:
(1)
Ma's equation:
(2)
----------------
(1)
(1)
and
(2)
(2)
(2)
Ma's rate is 40 mi/hr
--------------------
check:
From the time Pa leaves he covers
mi
This is mi less than Ma's
distance as it should be

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