Pa got in his ’29 Ford and started driving west from Jackson at a constant speed of 30 miles per hour?

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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 driving
[A] 40 m.p.h. [B] 35 m.p.h. [C] 32 m.p.h. [D] 32.5 m.p.h. [E] None of these

asked Dec 23, 2012 in Mathematics by anonymous
    

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