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 12 millimeters. The total height of the sand within the top portion of the hourglass is 47 millimeters. The radius of both the cylinder and cone is 4 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?

Answer 1

6.4

62.4

8.5

56.0

Answer 2

you will have to combine volume of cylinder and cone

Answer 3

cone's height is 12 and radius 4
find its volume

Answer 4

height of the cylinder ?

Answer 5

height of cylinder is not required,but height of sand in cylinder is
so it will be 47-12 = 35

Answer 6

you have height and radius of both
find the volumes

Answer 7

whats 35 ?