fresh water
The rapidity of cooling depends on the temperature difference between the two materials.
Fresh water.
I think it is fresh water freezes faster because the salt melts ice.
Fresh water.
At the same temperature fresh water evaporates faster.
salt water, as the salt water eats away at the coin faster.
Most probably , it would be fresh water. This is because since there is no salt which would keep the cold , the fresh water would melt faster.
salt will rust the coin faster thanfresh water
it is salt water because there is more oxagan in salt water then fresh water
Fresh water is evaporated faster.
salt water
Salt water