A boat can row 30 km upstream and 44 km downstream in 10 hours. Also it can row 40 km up stream and 55 km downstream in 13 hours. What is the speed of boat in still water?
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A boat can row 30 km upstream and 44 km downstream in 10 hours. Also it can row 40 km up stream and 55 km downstream in 13 hours. What is the speed of boat in still water?