The metre rule is in equilibrium at its midpoint. It still stays balanced when a $3.0\,\text{N}$ load is suspended from the $40\,\text{cm}$ mark and another load is suspended from the $80\,\text{cm}$ mark. Determine the weight of the second load.
- A$1.0\,\text{N}$
- B$1.5\,\text{N}$
- C$3.0\,\text{N}$
- D$9.0\,\text{N}$