Question 841802
<pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
A train leaves little rock, Arkansas, and travels north at 55 kilometers per hour. 
Another train leaves at same time and travels south at 80 kilometers per hour.?
how long {{{highlight_green(t)}}} will it take before they are 540 kilometers apart?
D = r{{{highlight_green(t)}}}
 55kmph{{{highlight_green(t)}}} + 80kmph{{{highlight_green(t)}}} = 540km
  t(55kmph + 80kmph) = 540km
        t = {{{(540/135) hr = (4hr)}}}