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Mathematics 14 Online
OpenStudy (anonymous):

Lauren rode her bike from her house to a friend's house 3.5 miles away. On the first part of her trip, she rode uphill at 3 miles per hour. The second part of the trip covered a larger distance but was downhill, and Lauren rode at 5 miles per hour. If the downhill part of the ride took half an hour, how many minutes did the uphill part take?

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