SOLUTION: Pa got in his '27 ford and started driving west from Memphis at a constant speed of 40 mph. An hour later ma got in her '34 Buick and started driving west from Memphis at a constan
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Question 884415: Pa got in his '27 ford and started driving west from Memphis at a constant speed 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?
You can put this solution on YOUR website! Pa got in his '27 ford and started driving west from Memphis at a constant speed 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?
:
From the information given, Pa's travel time = 5 hrs, Ma's = 4 hrs
Let s = Ma's driving speed
:
4s - 20 = 5(40)
4s = 200 + 20
s = 220/4
s = 55 mph is Ma's speed
:
:
See if that checks out, find the distance each traveled
4 * 55 = 220
5 * 40 = 200
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differ: 20 mi
