The figure below represents the tanks with the two holes,
The formula for the velocity is, v=√2gh The volumetric flow rate of square hole is, Vs=Av =x2×√2g×2 The volumetric flow rate of triangular hole is, Vt=Av =
√3
4
×42×√2g×6 since the flow rate is same, Vx=Vt x2×√2g×2=