Hi Aakancha,
In the question, rain water falls on a rectangular surface with 1 cm rain and gets transferred into a cylinder of radius = 20 cm and height h.
Thus,
Volume of Cuboid = Volume of Cylinder
For Cuboid,
Length = 6 m = 600 cm,
Breadth = 4 cm = 400 cm
Height = Rainwall = 1 cm
Thus,
Volume of Cuboid = Volume of Cylinder
l x b x h = πr2h
600 x 400 x 1 = π(20)2h
24000 = 400πh
400πh = 240000
πh = 240000/400
πh = 600
h = 600/π
h = 600/3.14
h = 191.08 cm
Written on March 24, 2017, 6:12 p.m.