Question 1056233
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Two trains are 500 miles apart when they first enter a collision course. If, after two hours, the distance between them 
is 300 miles and one train goes 20 mph faster than the other, find the speed of the faster train.
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<pre>
1)  500 - 300 = 200 miles is decreasing the distance between two trains in 2 hours.

2) {{{200/2}}} = 100 miles per hr is the sum of their rates.

   x + (x+20) = 100

   2x = 100-20

   x = {{{80/2}}}

   x = 40 mph slower

   x + 20 = 60 mph faster
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