Let the boat's speed in still water be \( x \) km/h and the stream's speed be \( y \) km/h. From upstream and downstream problems, you get two equations like \( \frac{d}{x-y} = t_1 \) and \( \frac{d}{x+y} = t_2 \). You solve them by elimination, making the denominators equal first. This reminds me of my mother patiently untangling two different coloured threads on her loom, separating them cleanly to see the pattern clearly.
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