Question

2.
A plot of land in the form of a rectangle has a dimension 240 m x 180m. A drainlet 10 m wide is dug
all around it and the earth dugout is evenly spread over the plot, increasing its surface level by 25 cm
Find the depth of the drainlet​

Answer 1

Answer:

you can search on google and maybe it is of visualing solid shapes

Answer 2

Answer:

The depth of the drainlet is 1.227 m

Step-by-step explanation:

Outer length ( including drainlet ) =(240+20) m =260 m

Outer breadth  ( including drainlet ) =(180+20) m =200 m  

∴ area of the drainlet =( 260×200 )m sq  − ( 240×180 )m sq

= 52000m sq − 43200m sq

= 8800m sq

Let x be the depth of the drainlet  

Then volume of earth dug out = Volume of earth spread on the land

⇒ 8800 × x = 180 × 240 × 0.25

⇒ x = 180 x 240 x 0.25/8800

= 27/22

= 1.2227 m

           I hope this answer will help you.........