A motorboat whose speed is \( 9 \mathrm{~km} / \mathrm{hr} \) in st...

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A motorboat whose speed is \( 9 \mathrm{~km} / \mathrm{hr} \) in still water, goes \( 15 \mathrm{~km} \) downstream and comes back in a total time of 3 hours 45 minutes. Find the speed of the stream.
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