Question

Hot water freezes in less time or cold water

Answer 1

hot water evaporates faster, so that if you started with equal masses of hot and cold water, there would soon be less of the hot water to freeze, and hence it would overtake the cold water and freeze first

Answer 2

the hot water  cools it loses mass to evaporation. With less mass, the liquid has to lose less heat  to cool, and so it cools faster. With this explanation