Given:
- Maximum allowable shear stress at point D, $\tau_{max} = 1.5 \text{ MPa}$
- Dimensions of the built-up section:
- Top flange: width = $150 \text{ mm}$ (from $50 \text{ mm} + 50 \text{ mm} + 50 \text{ mm}$), height = $50 \text{ mm}$
- Web: width =
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