If 20 engine parts can be produced in $x$ hours, the time to produce one engine part can be calculated using the following formula:

$\text{Time to produce one part} = \frac{x}{20} \, \text{hours}$

This means that the time to produce one part is simply $\frac{1}{20}$ of the total time taken to produce 20 parts.

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Here are 5 related questions:

1. If 50 engine parts are produced in $y$ hours, how long does it take to produce one part?
2. How long does it take to produce 100 parts if each part takes 0.2 hours to produce?
3. What is the rate of production per hour if 15 engine parts are made in 3 hours?
4. If the production rate increases by 25%, how long would it take to produce 20 engine parts?
5. How does the time per part change if the production process becomes 10% more efficient?

Tip: To solve problems involving rates of production, always start by finding the unit rate (the rate per single item).