SOLUTION: Normally it takes John 2.5 hours to drive from his house to his office. Due to yesterday's snowy weather he was driving 10 mph slower than usually, and it took 3 hours. How many mi

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Question 1134418: Normally it takes John 2.5 hours to drive from his house to his office. Due to yesterday's snowy weather he was driving 10 mph slower than usually, and it took 3 hours. How many miles is the office away from John's house?
Answer by ikleyn(52765) About Me  (Show Source):
You can put this solution on YOUR website!
.
Let x be the regular average rate, in miles per hour.


Under the severe condition, the average rate was  (d-10) miles per hour.


The distance is the same:


2.5*x = 3*(x-10).


Simplify and solve:


2.5x = 3x - 30

30 = 3x - 2.5x

30 = 0.5x  ===================>  x = 30/0.5 = 60 milies per hour.


ANSWER.  The distance is  60*2.5 = 150 miles.

Solved.


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