SOLUTION: Pa got in his '27 ford and started driving west from Memphis at a constant speen of 40 mph. An hour later ma got in her '34 Buick and started driving west from Memphis at a constan

Question 884369: Pa got in his '27 ford and started driving west from Memphis at a constant speen of 40 mph. An hour later ma got in her '34 Buick and started driving west from Memphis at a constant speed. After driving 4 hours ma had passed pea and was 20 miles ahead of him. How fast was ma driving?
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
Pa got in his '27 ford and started driving west from Memphis at a constant speen of 40 mph. An hour later ma got in her '34 Buick and started driving west from Memphis at a constant speed. After driving 4 hours ma had passed Pa and was 20 miles ahead of him. How fast was ma driving?
***
let x=ma's driving speed
distance=travel time*speed
4x=distance Ma traveled
5*40=distance Pa traveled
..
4x-5*40=20
4x=220
x=55
How fast was ma driving? 55 mph
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