Water overflow in the sink, Mechanical Engineering

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Water flows into the sink shown in figure 5 at a flow rate of 8 L/min. If the drain is closed, the water will eventually flow through the overflow drain holes rather than over the edge of the sink. What is the minimum number of 1-cm diameter drain holes needed to ensure that the water does not overflow the sink? Neglect viscous effects.(ρw=1000 kg/m3, g=9.81 m/s2)

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