How far and how much does the taxi from Tangkou to Huangshan/Tunxi airport cost?

Hi there,

I am planning to go to Tangkou, but I would like to enjoy the mountain during the day and I don't want to rush to catch the buses from Tangkou to Tunxi. I was wondering if anybody knows how far it is by taxi directly to the Tunxi airport and how long does it take?

Does anybody know the cost of the taxi as well? I can speak broken Chinese, so I can negotiate:)

Thank you.

Katka