I'm sorry I'm too lazy to read all of that. However, I did get the main point. The river was going at 3 mph. Since he wanted to travel 10 miles upstream and downstream, you would have to subtract 20 by 3. This would mean he was going at a speed of 17 mph.
The height of the envelope is 10. This is because you divide the area by 3. So, the missing side is 10 inches.
Statement: Your question is well elaborate and has all needed data.
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Step-by-step explanation:
mark brainliest
