An hourglass consists of two sets of congruent composite figures on either end. Each composite figure is made up of a cone and a cylinder.

Each cone of the hourglass has a height of 18 millimeters. The total height of the sand within the top portion of the hourglass is 54 millimeters. The radius of both cylinder and cone is 8 millimeters. Sand drips from the top of the hourglass to the bottom at a rate of 10π cubic millimeters per second. How many seconds will it take until all of the sand has dripped to the bottom of the hourglass?

68.3

38.4

268.8

230.4

Question

An hourglass consists of two sets of congruent composite figures on either end. Each composite figure is made up of a cone and a cylinder.

Each cone of the hourglass has a height of 18 millimeters. The total height of the sand within the top portion of the hourglass is 54 millimeters. The radius of both cylinder and cone is 8 millimeters. Sand drips from the top of the hourglass to the bottom at a rate of 10π cubic millimeters per second. How many seconds will it take until all of the sand has dripped to the bottom of the hourglass?

68.3

38.4 

268.8

230.4

anonymous · Answer

I'm just really confused...

anonymous · Answer

I know I need to find the volume of the cone, I got 384pi

anonymous · Answer

I don't know how to get the volume for the cylinder :/