hola como esta !

Que tal Estais is a Vosotros kind of speech. In some parts of Spain and other countries it is used and also in religious sermons. However, common speech does not use it. It is sort of like saying; "How art thou ?" It is used to show respect but speaking in Usted is good enough for showing respect.

muy bien.y tu?

muy bien gracias! y tu?

Bien ....pero tengo muchas tareas del españl todos los días!!! muy ocupada!