英文数学题,请大家帮忙!谢谢
apassengertrainleavesCharleston,W.Va,headingeastatthesametimealoadedcoaltrainleavesCh...
a passenger train leaves Charleston , W.Va , heading east at the same time a loaded coal train leaves Charleston heading west . the passenger train travels 23 mph faster than the coal train , and in 4 hours the two trains are 412 miles apart . what is the speed of each train?请写步骤!谢谢!
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