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

Answer 1

After 5 hours, the temperature in city A would be 70 - 5*5 = <<70-5*5=45>>45F.
Similarly, the temperature in city B would be 70 - 3*5 = <<70-3*5=55>>55F.
Therefore, city B is warmer than city A by 55 - 45 = <<55-45=10>>10F. Answer: \boxed{B}.