Question 1175276
<pre><font face = "consolas" color = "indigo" size = 3><b>
Hi
D = rt   Traveling opposite directions: 161mi apart after 7 hrs 
 xmph*7hr + (x+7)mph*7hr = 161mi
  14x = 161 - 49
    14x = 112
      x = 8mph, Paul's rate  and Isaac's rate is 15mph

 56mi + 105mi = 161mi  checks.   
Wish You the Best in your Studies.
</font></b></pre>