Let the speed of boat in still water =B and speed of stream =S then Speed of boat in Downstream =B+S, and Time = 6h Speed of boat in Upstream=B-S, Time = 9 h 36min=96/10=48/5h ATQ- 48/5(B-S) =6(B+S) 
B-S=10 … (1) B+S=16 … (2) B=13, S=3 Now ratio of boat speed and stream speed = 13:3
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