A well with 14m inside diameter is dug 10m deep. Earth taken out of it - has been evenly spread all around it to a width of 21m to form an embankment. The height (in metres) of the embankment is

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A well with 14m inside diameter is dug 10m deep. Earth taken out of it - has been evenly spread all around it to a width of 21m to form an embankment. The height (in metres) of the embankment is