To determine the greatest labor productivity, we can calculate the number of toy cars produced per labor hour for each option.
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Production of 20 toy cars in four hours: \[ \text{Labor productivity} = \frac{20 \text{ cars}}{4 \text{ hours}} = 5 \text{ cars per hour} \]
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Production of five toy cars in 2.5 labor hours: \[ \text{Labor productivity} = \frac{5 \text{ cars}}{2.5 \text{ hours}} = 2 \text{ cars per hour} \]
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Production of ten toy cars in ten labor hours: \[ \text{Labor productivity} = \frac{10 \text{ cars}}{10 \text{ hours}} = 1 \text{ car per hour} \]
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Production of five toy cars in two hours: \[ \text{Labor productivity} = \frac{5 \text{ cars}}{2 \text{ hours}} = 2.5 \text{ cars per hour} \]
Now comparing the labor productivity:
- First option: 5 cars per hour
- Second option: 2 cars per hour
- Third option: 1 car per hour
- Fourth option: 2.5 cars per hour
Thus, the option that represents the greatest labor productivity is the production of 20 toy cars in four hours (5 cars per hour).