1. Find the speed of the stream

Answer variants:
6.5 km/hr
5 km/hr
3 km/hr
2 km/hr
The speed of a boat in still water is 7 \(km/hr\). It can move 28 \(km\) upstream and 30 \(km\) downstream in 10 hours. Determine the speed of the stream.
 
The speed of the stream \(=\)
.
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