Q. 194.5( 15 Votes )

The rain water from a roof of dimensions drains into a cylindrical vessel having diameter of base 2 m and height 3.5 m. If the rain water collected from the roof just fill the cylindrical vessel, then find the rainfall (in cm).

Answer :

Let the rainfall be 'x' cm [i.e. 0.01x meters because 1 m = 100 cm ] .

For cylindrical vessel,

Diameter of base = 2 m

Base Radius = 1 m

[As radius = diameter/2]

Height, h = 3.5 m

As we know,

Volume of cylinder = πr2h

Where r is base radius and h is height of cylinder.


Volume of cuboidal vessel = π(1)2(3.5)


For roof

Length, l = 22 m

Breadth, b = 20 m

Height, h = height of rainfall = 0.01x m

As we know,

Volume of cuboid = lbh

Where l, b and h are length, breadth and height of the cuboid respectively.

Volume of water on roof = 22(20)(0.01x) = 4.4x m3


Volume of water on roof = volume of cuboidal vessel

4.4x = 11

x = 2.5 cm

Height of rainfall is 2.5 cm.

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