10. Find the speed of the stream

Answer variants:
8.5 km/hr
5 km/hr
4 km/hr
7 km/hr
The speed of a boat in still water is 9 \(km/hr\). It can move 24 \(km\) upstream and 28 \(km\) downstream in 8 hours. Determine the speed of the stream.
 
The speed of the stream \(=\)
.
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