Final answer:
To find how much of the science project Molly completes per hour, we need to divide Marley's completion rate by the duration. Marley completes 3/10 of the project in 4/5 of an hour, which simplifies to 3/8 of the project per hour.
Step-by-step explanation:
To find how much of the science project Molly completes per hour, we need to find the portion of the project that Marley completed in 1 hour. Marley completed 3/10 of the project in 4/5 of an hour. To find the portion completed in 1 hour, we need to divide 3/10 by 4/5.
Dividing fractions involves flipping the second fraction and multiplying. So, 3/10 divided by 4/5 is equal to (3/10) * (5/4). This can be simplified to (3 * 5) / (10 * 4), which is 15/40.
Therefore, Marley completes 15/40 of the science project in 1 hour. This can also be simplified to 3/8. So, Molly completes 3/8 of the science project per hour.