Two trains leave a station at the same time, traveling in opposite directions. One travels 20mph faster than the other. In 4 hours, the trains are 900 miles apart. Find the speed of each train.

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Two retinues permission a rank at the identical spell, traveling in antagonistic directions. One travels 20mph faster than the other. In 4 hours, the retinues are 900 miles privately. Find the expedite of each retinue. 

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