a) 2 m
b) 5 m
c) 6 m
d) 8 m
Answer: a
Explanation: Volume of the reservoir = 42000 litres = 42 m3
Let the depth of the reservoir be h metres
$$\eqalign{
& 6 \times 3.5 \times h = 42 \cr
& h = \frac{{42}}{{6 \times 3.5}} = 2\,m \cr} $$
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