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sam took 30min to drive her boat upstream to water-ski at her favorite spot. Coming back in the day, at the same boat speed, to

sam took 30min to drive her boat upstream to water-ski at her favorite spot. Coming back in the day, at the same boat speed, to 20 min. If the current in that part of the river is 7 km per hr, what was the boat speed in still water?

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