Question 1134427

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? Thank you for solving this problem! :)
<pre>Let distance be D
Then we get the following SPEED equation: {{{matrix(1,3, D/2.5, "=", D/3 + 10)}}}
6D = 5D + 150 ----- Multiplying by LCD, 15
6D - 5D = 150
Distance, or {{{highlight_green(matrix(1,4, D, "=", 150, miles))}}}