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Let the still water speed of boat ‘K’ = y km/h
Then, still water speed of boat ‘L’ = 1.5 × y = 1.5y km/h
Let the speed of the stream = x km/h
Effective speed = y + 1.5y = 2.5y km/h
So, 2.5y = 270 ÷ 3 = 90
y = 90 ÷ 2.5 = 36
Speed of boat ‘K’ in still water = 36 km/h
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