how many metres of earth must be dug out to sink a well which is 60 M Deep and which has a radius of 3.5 metre if the earth is taken out is spread over a rectangular plot dimensions 25 cm into 16 cm what is the height of the platform so formed
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Step-by-step explanation:
60 m deep =h
r=3.5=35/10
need to find volume first to find the earth that's dugged out
volume of cylinder = 22/7(pie)×r×2h
=22/7×35/10×120
=22×5×12
=1320 m3
now
let the plot be a cuboid
it's height be
volume of cuboid =l b h
=16×25×h
=400h is volume
now 1320 volume dirt must be filled in 400h volume cuboid
1320 =400h
1320/400=h
3.3=h
correct answer is 3.3cm
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