To find the option representing the greatest labor productivity, we need to calculate the labor productivity for each case, which is typically measured as the number of units produced per labor hour.
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Five toy cars in 2.5 labor hours: \[ \text{Productivity} = \frac{5 \text{ cars}}{2.5 \text{ hours}} = 2 \text{ cars/hour} \]
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Five toy cars in two hours: \[ \text{Productivity} = \frac{5 \text{ cars}}{2 \text{ hours}} = 2.5 \text{ cars/hour} \]
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Ten toy cars in ten labor hours: \[ \text{Productivity} = \frac{10 \text{ cars}}{10 \text{ hours}} = 1 \text{ car/hour} \]
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Twenty toy cars in four hours: \[ \text{Productivity} = \frac{20 \text{ cars}}{4 \text{ hours}} = 5 \text{ cars/hour} \]
Now, summarizing the productivities:
- First option: 2 cars/hour
- Second option: 2.5 cars/hour
- Third option: 1 car/hour
- Fourth option: 5 cars/hour
The option with the greatest labor productivity is the production of 20 toy cars in four hours (5 cars/hour).