Write the unit rate. Round to the nearest tenthif necessary 72 hr of work in 6 days 432 words in 8 min . $$ 315 \mathrm{mi} $$. on 15 gal . of gas $$ \$ 680 $$ for 4 tires

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Round the number by following steps:
- step0: Round $$12.0$$ to $$1$$ decimal places using standard rounding method:
  $$12.0$$
- step1: Round $$12.0$$ to $$1$$ decimal places using standard rounding method$$:$$
  $$12.0.0$$
Round the number $$ 54.0 $$ to nearest tenth.
Round the number by following steps:
- step0: Round $$54.0$$ to $$1$$ decimal places using standard rounding method:
  $$54.0$$
- step1: Round $$54.0$$ to $$1$$ decimal places using standard rounding method$$:$$
  $$54.0.0$$
Round the number $$ 170.0 $$ to nearest tenth.
Round the number by following steps:
- step0: Round $$170.0$$ to $$1$$ decimal places using standard rounding method:
  $$170.0$$
- step1: Round $$170.0$$ to $$1$$ decimal places using standard rounding method$$:$$
  $$170.0.0$$
Round the number $$ 21.0 $$ to nearest tenth.
Round the number by following steps:
- step0: Round $$21.0$$ to $$1$$ decimal places using standard rounding method:
  $$21.0$$
- step1: Round $$21.0$$ to $$1$$ decimal places using standard rounding method$$:$$
  $$21.0.0$$
Let's calculate the unit rates for each scenario:

1. **72 hours of work in 6 days**:
   $$
   \text{Unit Rate} = \frac{72 \text{ hr}}{6 \text{ days}} = 12 \text{ hr/day}
   $$
   Rounded to the nearest tenth: **12.0 hr/day**.

2. **432 words in 8 minutes**:
   $$
   \text{Unit Rate} = \frac{432 \text{ words}}{8 \text{ min}} = 54 \text{ words/min}
   $$
   Rounded to the nearest tenth: **54.0 words/min**.

3. **315 miles on 15 gallons of gas**:
   $$
   \text{Unit Rate} = \frac{315 \text{ mi}}{15 \text{ gal}} = 21 \text{ mi/gal}
   $$
   Rounded to the nearest tenth: **21.0 mi/gal**.

4. **$680 for 4 tires**:
   $$
   \text{Unit Rate} = \frac{680 \text{ dollars}}{4 \text{ tires}} = 170 \text{ dollars/tire}
   $$
   Rounded to the nearest tenth: **170.0 dollars/tire**.

### Summary of Unit Rates:
- **12.0 hr/day**
- **54.0 words/min**
- **21.0 mi/gal**
- **170.0 dollars/tire**
- 12.0 hr/day - 54.0 words/min - 21.0 mi/gal - 170.0 dollars/tire

Write the unit rate. Round to the nearest tenthif necessary 72 hr of work in 6 days 432 words in 8 min . \( 315 \mathrm{mi} \). on 15 gal . of gas \( \$ 680 \) for 4 tires

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