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31. A river is 2 km wide and flows at 4 km/h. A motorboat that has a speed of 10 Ion/h in still water heads

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31. A river is 2 km wide and flows at 4 km/h. A motorboat that has a speed of 10 Ion/h in still water heads out from one bank, which is perpendicular to the current. A marina lies directly across the river, on the opposite bank. a. How far downstream from the marina will the motorboat touch the other bank? b. How long will it take for the motorboat to reach the other bank

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