A field is 120 m long and 70 m broad. In one corner of field a pit which is 20 m long , 20 m broad & 8 m deep has been dug out. The earth taken out of it is evenly spread over the remaining part of the field. Find the rise in the label of the field.

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 Volume of earth = 20 * 20 * 8

                              = 3200 m3

Area of remaining field = (120 * 70) - (20 * 20)

                                          = 8000 m2

 Hence , rise in level = 3200/8000

                                       2/5 m or 40 cm

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