Two trains leave Union Station at the same time with one train traveling north at 20 miles per hour and the other train traveling east at 30 miles per hour. How fast is
the distance between the two trains changing after 3 hours? show work

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Answerthe simplified expression isexplanationthe given expression is,let us deal with the bracket first.the two negatives in the parenthesis will become positive.the expression now becomes,we now expand the parenthesis to get,we group like terms to obtain,this simplifies to,