Mathematics
NULL
Medium
Question
A rectangular plot is 240 m × 180 m. A drain 10 m wide is dug all around it on the outside and the earth is spread over the plot, raising its level by 25 cm. The depth of the drain is?
A
1.227m
✓ Official correct answer
B
1.225m
C
1.233m
D
1.229m
Community credibility
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A
1.227m
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B
1.225m
No member explanations yet for this option.
C
1.233m
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D
1.229m
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Explanation
Drain area = 260×200 − 240×180 = 8800 m². Earth volume = 240×180×0.25 = 10,800 m³. Depth = 10800/8800 ≈ 1.227 m.