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I drove to the beach at a rate of 40 miles per hour.  If I had driven at a rate of 42 miles per hour instead, then I would have arrived 45 minutes later.  How many miles did I drive?

 Jun 4, 2023
 #1
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D/40 ==T,   [T==Time]

D/42==T - 45/60, solve for D, T

 

Use substitution to get:

 

D==630 miles to the beach !!

 Jun 4, 2023
 #2
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I drove to the beach at a rate of 40 miles per hour.  If I had driven at a rate of 42 miles per hour instead, then I would have arrived 45 minutes later.  How many miles did I drive?   

 

Are you sure you copied the problem correctly?   

It doesn't make sense to drive faster and arrive later.    

.

 Jun 4, 2023

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