Question 1202491
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The distances are the same, and the ratio of the two times is 4:5, so the ratio of the two speeds is 5:4.<br>
Simple reasoning says that, since the difference in the two speeds is 10 mph, the two speeds are 50 mph and 40 mph.<br>
More formally, using the 5:4 ratio of the speeds....<br>
Let 5x be the speed of the express train
Let 4x be the speed of the freight train<br>
The express train is 10 mph faster than the freight train:<br>
5x-4x=10
x=10<br>
ANSWERS:
freight train speed = 4x = 40 mph
express train speed = 5x = 50 mph<br>