Question

A well is dug 20 m Deep and it has diameter of 7m the Earth which is so dug out is spread out on a rectangular plot of 22 M long and 14m wide what is the height of the platform so formed

Answer 1

Answer:

2.5 meters

Step-by-step explanation:

depth of well= 20 m

diameter of well= 7 m

∴r= 3.5 m

Volume of well = πr²h

                         = 22/7 × 3.5 × 3.5 × 20

                         = 770

Now, Volume of rectangular plot = lbh

                                                       =22 × 14 × h

                                                       =308 × h

According to question,

          Volume of rectangular plot = Volume of well

       ⇒  308 × h = 770

       ⇒ h = 770/308

       ⇒ h = 2.5 m