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A ship sails north for 2 hours, traveling a total of 15 miles. Then the ship turns south and travels 6 miles in an hour.


If north is taken as the positive direction, what is the velocity of the ship?



7 miles per hour , 7 miles per hour , ,


–3 miles per hour , –3 miles per hour , ,


3 miles per hour , 3 miles per hour , ,


–7 miles per hour

please help!!!