$$ V_{\text{total}} = \int_{0}^{T} Q(t) \, dt = \sum_{i=1}^{3} \left( \int_{t_{i-1}}^{t_i} Q_i(t) \, dt \right) $$
$$ \text{Dengan } Q_i(t) = \text{Laju aliran air (Liter/jam) pada sesi ke-i} $$ $$ \text{Karena } Q_i \text{ konstan per sesi: } \int_{t_{i-1}}^{t_i} Q_i \, dt = Q_i \times \Delta t_i $$
$$ V_{\text{pagi}} = Q_{\text{pagi}} \times 4 \text{ jam},\quad V_{\text{siang}} = Q_{\text{siang}} \times 3 \text{ jam},\quad V_{\text{sore}} = Q_{\text{sore}} \times 3 \text{ jam} $$ $$ V_{\text{total}} = V_{\text{pagi}} + V_{\text{siang}} + V_{\text{sore}} $$
$$ \text{Air per warga} = \frac{V_{\text{total}}}{\text{Jumlah Warga}} $$ $$ \text{Air per truk} = \frac{V_{\text{total}}}{\text{Jumlah Truk Total}} $$