A boat goes $15km$ upstream and $22km$ down stream in $15$ hours. In $14$ hours it can go $45$ upstream and $55km$ down stream. The speed of the boat in still water in $km/hr$ is
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A boat goes $15km$ upstream and $22km$ down stream in $15$ hours. In $14$ hours it can go $45$ upstream and $55km$ down stream. The speed of the boat in still water in $km/hr$ is