Correct Answer - Option 4 : 50 cm

**Given**

Capacity of cubical box = 125 litres

**Formula used**

Volume of cube = (side)^{3}

1 L = 1000 cm^{3}

**Calculation**

125 L = 125 × 1000 cm^{3}

⇒ 125 L = 125000 cm^{3}

⇒ (Side)^{3 }= 125000

⇒ Side = 50 cm

**∴ The side of a box is 50 cm**