A river is flowing from W to E with a speed of 5 m/min. A man can swim in still water with a
velocity 10 m/min. In which direction should the
man swim so as to take the shortest possible path
to go to the south :-

This is the answer of your question

The chemical reactions lab we did is typically called a "copper plating lab,  because the acid solution cleaned the pennies and made the copper look shinier;   the acid solution cleaned the paperclips and made them look like pennies;   &   the copper from the pennies was removed, and then added to the paperclips. 

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