A plot of land in the form of a rectangle has dimensions 240 m × 180 m. A drain-let 10 m wide is dug all around it (outside) and the earth dug out is evenly spread over the plot, increasing its surface level by 25 cm. The depth of the drain-let is :
A. 1.223 m
B. 1.225 m
C. 1.227 m
D. 1.229 m
Answer: Option C
Solution(By Examveda Team)
Volume of earth dug out := (240 × 180 × 0.25) m3
= 10800 m3
Let the depth of the drain-let be h metres
Then, Volume of earth dug out :
= [{(260 × 200) - (240 × 180)}h ] m3
= (8800h) m3
∴ 8800h = 10800
⇒ h = $$\frac{10800}{8800}$$
⇒ h = $$\frac{27}{22}$$
⇒ h = 1.227 m
Related Questions on Volume and Surface Area
A. 12$$\pi$$ cm3
B. 15$$\pi$$ cm3
C. 16$$\pi$$ cm3
D. 20$$\pi$$ cm3
In a shower, 5 cm of rain falls. The volume of water that falls on 1.5 hectares of ground is:
A. 75 cu. m
B. 750 cu. m
C. 7500 cu. m
D. 75000 cu. m
A. 84 meters
B. 90 meters
C. 168 meters
D. 336 meters
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