An hour glass consists of two sets of congruent composite figures on either end. Each composite figure is made of a cone and cylinder.
Each cone of the hour glass has a height of 15mm. The total height of the sand within the top of the portion of the hour glass is 45mm. The radius of the cone and cylinder is 6mm. Sand drops from the top of the hour glass to the bottom at a rate of PI10 (no symbol on my keyboard). How many seconds will it take until all of the sand has dripped to the bottom of the hourglass?

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the answer choices are 126, 108, 18, and 29. help would be appreciated asap please (:

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