Coins are dropped into a toll box so that the box is being

fiendex · **Posted:** Sun Feb 05, 2012 5:15 pm


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Coins are dropped into a toll box so that the box is being filled at the rate of approximately 2 cubic feet per hour. If the empty rectangular box is 4 feet long, 4 feet wide, and 3 feet deep, approximately how many hours does it take to fill the box?

A) 4
B) 8
C) 16
D) 24
E) 48

[Reveal] Spoiler: OA

D

dentobizz · **Posted:** Sun Feb 05, 2012 5:54 pm

fiendex wrote:

coins are dropped into a toll box so that the box is being filled at the rate of approximately 2 cubic feet per hour. If the empty rectangular box is 4 feet long, 4 feet wide, and 3 feet deep, approximately how many hours does it take to fill the box?

A) 4
B) 8
C) 16
D) 24
E) 48

For finding the rate at which the box will be full we need to find the volume of the box , the volume of a rectangular cuboid = length*width*ht/depth= 4*4*3=48 cu.ft

This box is getting filled at the rate of 2 cu.ft per hour. Therefore, to fill the complete box having the volume 48 cu.ft it will take --48/2= 24 hours ie option D.

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Coins are dropped into a toll box so that the box is being

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