The temperature is dropping throughout the day as a cold front comes in. In City A, the temperature is changing by -5 degrees F per hour, and in City B the temperature is changing by -3 degrees F per hour. If the temperatures in both cities started at 70 degrees F, Which city is warmer, and what is the difference in their temperatures after 5 hours?

Question

A. City A is warmer by 2 degrees F.
B. City B is warmer by 2 degrees F.
C. City A is warmer by 10 degrees F.
D. City B is warmer by 10 degrees F.

Answer 1

City A is changing by -5 degrees per hour, so after 5 hours, the temperature in City A would be 70 - (5 * 5) = 45 degrees F.

City B is changing by -3 degrees per hour, so after 5 hours, the temperature in City B would be 70 - (3 * 5) = 55 degrees F.

Therefore, City B is warmer by 10 degrees F. The answer is D. City B is warmer by 10 degrees F.