Selma's class is making care packages to give to victims of natural disaster. Selma packs one box in 5 minute and has already packed 12 boxes. Her friend Trudy packs one box in 7 minute and has already packed 18 boxes. How many more minutes does each need to work in order to have the same number of boxes?

What do YOU think ?
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How much faster is Selma? What is the current difference in total boxes by each. How much does Selma gain in each box?