Ruben is driving along a highway that passes through Barstow. His…

Ruben is driving along a highway that passes through Barstow. His distance d, in miles, from Barstow is given by the equation d = |230 − 50t|, where t is the time, in hours, since the start of his trip and 0 ≤ t ≤ 7. When will Ruben be exactly 80 miles from Barstow?

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