On a cold January morning, the radiator fluid in Kuri’s car is Negative 15 degrees° F. With the engine running, the temperature rises by 2.5°F per minute. How long before the radiator temperature reaches 40°F?

Answer 1

To find the time it takes for the radiator temperature to rise from -15°F to 40°F, we first calculate the total temperature increase needed:

$$40°F-(-15°F)=40°F+15°F=55°F$$

Next, we know that the temperature rises at a rate of 2.5°F per minute. To find the time required to achieve a 55°F increase, we use the formula:

$$\text{Time}=\frac{\text{Temperature Increase}}{\text{Rate of Increase}}$$

Substituting the values, we have:

$$\text{Time}=\frac{55°F}{2.5°F/\text{minute}}=22\text{ minutes}$$

Therefore, it will take 22 minutes for the radiator temperature to reach 40°F.