A field is in the shape of a rectangle of length 90 m and breadth 75 m. In one corner of the field, a pit, which is 18 m long 15 m broad and 6 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 level of the field?

25 cm

We know that,

Volume = L × B × H

Surface area = L × B

The total area of the field = 90 × 75 = 6750 m² 

Area of the pit = 18 × 15 = 270 m² 

Remaining area = 6750 - 270 = 6480 m² 

The volume of the pit = 18 × 15 × 6 = 1620 m³ 

The volume of the pit = Volume of the remaining field

= 1620 = 6480 × H

H = 0.25m or 25 cm