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For the purpose of showing the solution to this item, we let the basis in which we are to determine the number of trains that passed through be 1 day. That being said, we convert 1 day to number of minutes by using the correct conversion factor and dimensional analysis as below.

       (1 day)(24 hours/1 day)(60 minutes/1 hour) = 1440 minutes

Then, divide the calculated number of minutes by 20.

            number of trains = 1440 minutes x (1 train / 20 minutes)
             number of trains = 72 trains

Answer: 72 trains
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