Ez.2.A tank 40 m long, 30 m broad a...
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Ez.2.A tank 40 m long, 30 m broad and 12 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 of the tank is evenly spread over the field ?

11th - 12th Class
Maths
Solution
109
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Sol. (3) Volume of earth taken out ( =40 times 30 times 12 ) ( =14400 ) cu.metre Area of the rectangular field ( =1000 times 30=30000 ) sq. metre Area of the region of ( tan k=40 times 3 ) ( =1200 ) sq. metre Remaining area ( =30000-1200 ) ( =28800 ) sq. metre Increase in level ( =frac{14400}{28800}=0.5 ) metre
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