Question:
Tick (✓) the correct answer:
A rectangular water reservoir contains 42000 litres of water. If the length of reservoir is 6 m and its breadth is 3.5 m, the depth of the reservoir is
(a) 2 m
(b) 5 m
(c) 6 m
(d) 8
Solution:
(a) $2 \mathrm{~m}$
$42000 \mathrm{~L}=42 \mathrm{~m}^{3}$
Volume $=l b h$
$\therefore$ Height $(h)=\frac{\text { volume }}{l b}=\frac{42}{6 \times 3.5}=\frac{6}{6 \times 0.5}=2 \mathrm{~m}$