A tank 4m long and 2.5 m wide and 6 m de...

A tank 4m long and 2.5 m wide and 6 m deep is dug in a field 10 m long and 9 m wide. If the earth dugout is evenly spread over the field , the rise in level of the field will be :

80cm

75 cm

60 cm

30 cm

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