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.
Question : In the context of industrial water use, what is a common method for reducing water consumption?
Option 1: Increasing water discharge into rivers
Option 2: Using saltwater for cooling processes
Option 3: Implementing water recycling and reuse systems
Option 4: Relying solely on rainfall for water supply
Question : Water cycle refers to
Option 1: an integrated attempt to recycle water in relatively arid regions
Option 2: the constant movement of water from the ocean to land and back to the ocean once again
Option 3: scientific management of water in areas excessively plagued with waterlogging
Option 4: water distribution in relatively dry areas
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