Here's why:

* Solubility: Sugar is more soluble in water than salt. This means that sugar dissolves more readily and creates a more concentrated solution.

* Polarity: Sugar is a polar molecule, meaning it has a positive and negative end. Water is also a polar molecule, and like dissolves like. The polar nature of sugar and water allows them to interact and dissolve readily.

* Osmosis: Sugar water has a higher osmotic pressure than salt water. This means that water molecules move from an area of low concentration (salt water) to an area of high concentration (sugar water). This movement of water helps to dissolve the pill faster.

However, there are exceptions:

* Pill composition: Some pills are specifically formulated to dissolve in acidic solutions. In these cases, salt water (which is slightly acidic) might dissolve the pill faster.

* Temperature: Higher temperatures generally lead to faster dissolution rates for both sugar and salt water.

Important Note:

It's generally not recommended to dissolve pills in any liquids unless specifically instructed by a doctor or pharmacist. Doing so can alter the intended dosage and effectiveness of the medication.