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I am in high school and I have a question that I haven't been able to solve for a very long time. Please help?

A sand timer consists of two cones joined at the apex. Each cone has height h, radius r and an angle at the apex of 60°.

Express the radius of the top cone in terms of its height. Give your answer in exact form.

I am stuck and don't know how to complete this question. Could you please help?

Thank you! ^^

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    How sand can go from top cone to the bottom cone if there is no passage between them...2012-05-06
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    @pedja: The question didn't say it was a *working* sand timer. ;)2012-05-12

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