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Question
The length, breadth and height of a cuboidal reservoir is 7 m, 6 m and 15 m respectively. 8400 L of water is pumped out from the reservoir. Find the fall in the water level in the reservoir.
Solution
Length of a cuboidal reservoir = 7 m
Breadth of a cuboidal reservoir = 6 m
Height of a cuboidal reservoir = 15 m
Capacity of cuboidal reservior = `l xx b xx h` = 7 × 6 × 15 = 630 m3
If 8400 L of water is pumped out.
In meter cubic = `8400/1000` = 8.4 m3
Fall in water level = 630 – 8.4 = 621.6 m3
= 621.6 × 1000 ...[∵ 1 m3 = 1000 L]
= 621600 L
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