Final answer:
The distance between the Moon and the Sun in their model would be 93 million steps.
Step-by-step explanation:
To calculate the distance between the Moon and the Sun in their model, we need to consider their chosen scale factor of one million miles represented by one step. In reality, the Moon is about 240 thousand miles away from Earth, and the Sun is about 93 million miles away from Earth. So, if Earth and the Moon are represented by one step, and Earth and the Sun are represented by 93 million steps, then the distance between the Moon and the Sun in their model would be 93 million steps.