Physics rubber duck?
Hello, I got a physics question, but I'm not sure. I got 0=0 for the river's speed. Can anyone help me? "There are two bridges across a small river, exactly one kilometer apart. A man rows upstream at a constant speed. Just below the second bridge, he loses his mascot, a small rubber duck. He continues rowing, however, and notices the loss ten minutes later. He then turns around and rows downstream in the same amount of time. He reaches his rubber duck just below the first bridge. How fast does the river flow in the area between the bridges if no time is taken into account for the turning?"
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So he drove up the curse and noticed 10 minutes after the second bridge where he had forgotten the duck that he had forgotten the duck. Then he meets the duck another 10 min later at the first bridge.
So he needed 20 minutes until he had the duck again. The rubber ink needed 20min to get from one bridge to another.
So she needed to travel for 20 minutes by 1 km. The speed of the duck = flow velocity.
20×3=60min
1km×3= 3km/h
The river flows 3 km/h fast.
I’m not sure, because the duck may just land at 10min at the first bridge, which is not indicated if there is no flow from the first bridge and it is waiting there
How should a river just stop flowing after a certain runway? This is physically impossible and a completely irrational assumption. The solution of MPSEVEN is absolutely correct.
The solution is absolutely correct and logically understandable.
Sure is my solution wrong but its is not quite right
In my comment, I have asked what time is meant, but it must be the 10 minutes, even if this makes the task very simple, which is why I was irritated, as mpseven shows. Because the distance downstream of the river must of course be travelled significantly faster than the same way against the current. It would be interesting to find out if the goal of the task was to leave everything away and only use the duck. Generally, this is the escalator up and down or river against with electricity swimming task type.