The total flow rate entering pipe 1 is given as \( Q_1 = 1.388 \times 10^{-3} \, \text{m}^3/\text{s} \). Since the flow divides equally into the two pipes 3, the flow rate in each pipe 3 is:
\[
Q_3 = \frac{Q_1}{2} = \frac{1.388 \times 10^{-3}}{2} = 0.694 \times
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