Traveling at full speed on a river, it takes 2 hours for a motor boat to travel 8 miles downstream and 4 miles back upstream. if the current's speed is 2 mph, what is the maximum speed of the boat in still water?
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speed of boat --- x km/h speed of current -- y km/h =2mphtime= diatance/speed
x=0 or x=6
maximum speed of boat in still water =6 mph
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