SOLUTION: Two cars leave town at the same time going in the same direction. One travels at 45 mph and the other travels at 68 mph. In how many hours will they be 138 miles apart.

Question 241448: Two cars leave town at the same time going in the same direction. One travels at 45 mph and the other travels at 68 mph. In how many hours will they be 138 miles apart.
Found 2 solutions by Alan3354, stanbon:
Answer by Alan3354(21605) (Show Source):
You can put this solution on YOUR website!
Two cars leave town at the same time going in the same direction. One travels at 45 mph and the other travels at 68 mph. In how many hours will they be 138 miles apart.
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They're separating at 23 mph (68 - 45)
138/23 = 6 hours

Answer by stanbon(48558) (Show Source):
You can put this solution on YOUR website!
Two cars leave town at the same time going in the same direction. One travels at 45 mph and the other travels at 68 mph. In how many hours will they be 138 miles apart.
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1st car:
rate = 45 mph ; time = x hrs ; distance = 45x miles
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2nd car :
rate = 68 mph ; time = x hrs ; distance = 68x miles
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Equation:
distance 2 - distance 1 = 138 miles
68x - 45x = 138
23x = 138
x = 6 hours
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Cheers,
Stan H.