Rainfall: depth of rain x area = volume of water

This type of question, asked 3 times: CDS 2 2016, CDS 1 2022, CDS 1 2025. All 3 questions below, oldest first.

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Question 1
CDS 2 2016
57 $22\ \text{m} \times 20\ \text{m}$
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Question 2
CDS 1 2022
89 $In a shower, 5 cm of rain falls. What is the volume of water that falls on 2 hectare area of land?$
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Question 3 (case study, 2 parts)
CDS 1 2025
The annual rainfall at a place is 40 cm. The weight of water is 1 metric tonne per cubic meter.
67 $What is the volume of rainfall in cubic meter per hectare ?$
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68 $What is the weight of water (in metric tonnes) of annual rainfall falling there on a hectare of land ?$
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Question 1