Write the unit rate. Round to the nearest tenth if necessary 24. 72 hr . of work in 6 days 25. 432 words in 8 min . 26. 315 mi . on 15 gal . of gas 27. \( \$ 680 \) for 4 tires

To find the unit rate, you divide the total quantity by the number of units. For the first one, \(72 \text{ hr} \div 6 \text{ days} = 12 \text{ hr/day}\). That's some serious work time! Next, for the words, \(432 \text{ words} \div 8 \text{ min} = 54 \text{ words/min}\). Talk about fast writing! For the mileage, \(315 \text{ mi} \div 15 \text{ gal} = 21 \text{ mi/gal}\). You'll be cruising far with that! Lastly, for the tires, \(\$680 \div 4 = \$170\) per tire. That's a solid investment for your wheels!