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A tank 40 m long, 30 m broad, and 20 m deep is dug in a field 1000 m long and 30 m wide. By how much will the level of the field rise if the earth dug out

the tank is evenly spread over the field?


Volume of earth dug out=volume of tank
                                   =24000 cubic metre

 area of field not dug out= (1000-40)*30
                                   =28800 metre square

increase in leavel of the field = 24000/28800
                                          = 0.8333m
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