Need for this proper answer$-$ A community requires a maximum flow of $30$ million litres per day of water during $10$ hours in

a peak day, beginning at $8am$ and ending at $6pm.$ During the remaining $14$ hours, it needs a

flow of $6$ million litres per day. During the entire $24$ hours, the water treatment plant is able.

to provide a constant flow of $18$ million litres per day, which is pumped into the distribution

system $($see figure below$).$ How large nust the elevated storage tank be to meet this peak

demand?