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Bill is walking up the steps in the Washington Monument at a rate of $30$ feet per minute and Joe is walking down at the rate of $45$ feet per minute. Bill is $75$ feet from the bottom at the same moment that Joe is $325$ feet from the bottom. Which of the following systems of equations can be used to determine the number of minutes, $t$, from now and height, $h$ (in feet), at which they will pass each other?$\newline$Choose $1$ answer: