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ATQ,
Let the still water speed of boat ‘N’ = ‘y’ km/h
Then, still water speed of boat ‘M’ = 2 × y = ‘2y’ km/h
Let stream speed = ‘x’ km/h
Effective relative speed = 2y + y = ‘3y’ km/h
So, 3y = 360 ÷ 6 = 60
y = 60 ÷ 3 = 20
Speed of boat ‘N’ in still water = 20 km/h
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