Water discharges from a cylindrical tank through an orifice, as shown in the figure. The flow is considered frictionless. Initially, the water level in the tank was \( h_1 = 2 \, \text{m} \). The diameter of the tank is \( D = 1 \, \text{m} \), while the diameter of the jet is \( d = 10 \, \text{cm} \), and the acceleration due to gravity is \( g = 10 \, \text{m/s}^2 \). The time taken (in seconds, up to one decimal place) for the water level in the tank to come down to \( h_2 = 1 \, \text{m} \) is \(\underline{\hspace{2cm}}\).
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