Question 398964
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Hi
second car leaves 1 hour later
Let x and (x-1hr)represent the times traveled by the first and second car respectively 
Question states*** (Note: Distance traveled will be the same.  D = r*t
 60mph(x) = 70mph(x-1)
solving for x
     70mph = 10mph(x)
       x = 7hr, time traveled by first car.
It will take the second car 6 hrs to catch it
CHECKING our Answer***
 60mph*7hr = 70mph*6hr