Question 1197607
<pre><font face = "consolas" color = "indigo" size = 3><b>
Hi  
D = rt  0r t = D/r
Let D represent the distance one-way
Time it takes to go to and from is the same ...
whether it be at varying speeds or at the average speed.
{{{D/50mph + D/40mph = 2D/average speed}}}  Divide Thru by D
Let A be the average speed:
  1/50 + 1/40 = 2/A
     90/2000= 2/A
          A = 2*(2000/90) = 44.4 mph rounded
Wish You the Best in your Studies.
</font></b></pre>