Question

we are able to sip hot tea faster from a sauser than a cup why

Answer 1

Because surface area of saucer is more than a cup and it gradually increases the rate evaporation and heat reduces and it becomes easy for us to sip from saucer as compared to a cup.

Answer 2

From a saucer when we drink the tea becomes a bit colder faster as the surface area increases and this increases the area from which the liquid can evaporate.
and evaporation cools down things like when the particles evaporate they take the heat from the bottom particles and this makes the hot tea cold.
so we can drink easily.