Question

$1$ cusec is equal to how many litres?

Answer 1

Representation of cusec in liters.

Cusec is equal to cubic feet per second.

$1\mathrm{feet}=30.48\mathrm{cm}$

So,

$$\begin{gathered} 1\mathrm{cubic}\mathrm{feet}=30.48\mathrm{cm}\times 30.48\mathrm{cm}\times 30.48\mathrm{cm} \\ =28,316.85{\mathrm{cm}}^3 \\ =\frac{28,316.85}{1000}\left[\because 1000{\mathrm{cm}}^3=1\mathrm{litre}\right] \\ =28.317\mathrm{litres} \end{gathered}$$

Hence, $\mathbf{1}\mathbf{}\mathbf{cusec}\mathbf{=}\mathbf{28}\mathbf{.}\mathbf{317}\mathbf{}\mathbf{litres}$.