Which change to the design of the solar cooker would make the water in the cook pot boil faster?

To make the water in the solar cooker boil faster, you could consider the following changes:

1. Increase the Reflective Surface: The more sunlight you can direct onto the pot, the faster the water will boil. You can do this by increasing the size of the reflective surface or using a more reflective material.

2. Improve Insulation: To prevent heat loss, improve the insulation around the cooking area. This could be done by using materials with better insulating properties or by simply increasing the thickness of the existing insulation.

3. Use a Darker Pot: Dark colors absorb more heat than light colors. So, using a black or dark-colored pot can help the water to heat up faster.

4. Use a Lid: A lid on the pot will trap the heat inside, causing the water to heat up faster.

5. Optimize the Cooker's Orientation: The cooker should be oriented towards the sun for maximum exposure. The angle might need to be adjusted throughout the day as the sun moves across the sky.

Remember, safety should always be a priority when making these modifications.