A motorboat coverse a distance between two points in `4h` along the flow and in `8h` opposite to the flow. In how much time, distance can be covered in still water?

Explanation

To solve the problem step by step, we will use the information provided about the motorboat's travel times along and against the flow of water.

### Step 1: Define Variables
Let:
- \( D \) = distance between the two points
- \( V \) = speed of the motorboat in still water
- \( U \) = speed of the water flow

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