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In city A, the temperature is changing by -5°F per hour, so after 5 hours, the temperature would be:
70°F - 5°F/hour * 5 hours = 70°F - 25°F = 45°F
In city B, the temperature is changing by -3°F per hour, so after 5 hours, the temperature would be:
70°F - 3°F/hour * 5 hours = 70°F - 15°F = 55°F
Therefore, after 5 hours, city B is warmer than city A by 10°F (55°F - 45°F).