SOLUTION: A van​ averages 9 miles per hour faster than a car. If the van travels 100 miles in the same time it takes the car​ to travel 70 miles, then what is the speed of each?

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Question 1125034: A van​ averages 9 miles per hour faster than a car. If the van travels 100 miles in the same time it takes the car​ to travel 70 miles, then what is the speed of each?
Answer by josgarithmetic(39617)   (Show Source): You can put this solution on YOUR website!
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A van​ averages 9 miles per hour faster than a car. If the van travels 100 miles in the same time it takes the car​ to travel 70 miles, then what is the speed of each?
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A van​ averages k miles per hour faster than a car. If the van travels D miles in the same time it takes the car​ to travel d miles, then what is the speed of each?
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(Note very carefully, ). 

Unknowns:  x and r

           SPEED          TIME         DISTANCE
VAN         r+k           x=D/(r+k)        D
CAR         r             x=d/r            d


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-----substitute your given values.
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