A rectangular water reservoir contains 42000 litres of water. If the length of reservoir is 6 m and breadth of the reservoir is 3.5 m, then the depth of the reservoir will be :

Answer: Option A

Volume of the reservoir = 42000 litres = 42 m³
Let the depth of the reservoir be h metres
then,
$$\begin{array}{rl}& 6\times 3.5\times h=42\\ & Or,h=\frac{42}{6\times 3.5}=2m\end{array}$$