Question 895461

How long will it take the car going 70mph to travel 70 miles?  1 hour, right?  Your brain mentally did that automatically, dividing {{{70miles/70mph}}}
For 80mph, do the same thing -- just with the different value
{{{70miles/80mph}}}=.875 hours
Multiply the fraction by 60 (60 minutes in an hour) to find that it will take him 52.5 minutes