Hey there! Based on the information you’ve provided:
1. The speed of the man upstream is calculated as (25.8km)/(8.6hrs) , which gives us around 3 km/h.
2. The speed downstream is (20km)/(4hrs), so 5 km/h.
To find the speed of the man in still water, we use the formula:
Speed in still water = (upstream speed+ downstream speed)/2
So, (3+5)/2 = 4km/h
Therefore, the speed of the man in still water is 4 km/h.
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