Question
A well with 30 metre inner diameter is dug 6 m deep.
Earth taken out of it, has been evenly spread all around it to a width of 15 m to form an embankment. The height (in metres) of the embankment is :Solution
Let the required height = h metres Therefore, [(60/2)2 - (30/2)2] x h = (30/2)2 x 6 h = 2 m
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