Leanna Dougherty

Mathematics

13 June, 23:27

Your neighbor leaves his yard, which is 120 ft from the bus stop. He begins to walk toward you at the bus stop and then passes you. He walks at a speed of 4 ft/s. His distance d from you after t seconds is given by d = |120 - 4t|. After how many seconds is your neighbor 30 ft from you?

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