Water flows through a horizontal tube as shown in the figure. The difference in height between the water columns in vertical tubes is \( 5 \, \text{cm} \) and the area of cross-sections at A and B are \( 6 \, \text{cm}^{2} \) and \( 3 \, \text{cm}^{2} \) respectively. The rate of flow will be ______________ \( \text{cm}^{3} / \text{s} \). \( \text{(take } g = 10 \, \text{m} / \text{s}^{2} \text{)} \)
