I beg to differ! I believe that it has to do with the temperature scales each uses (US - Fahrenheit, Canada - Celsius).The Canada/ Hawaii difference is to assume that the ice will stay frozen in Canada, but will eventually melt in Hawaii
For question number 8, I think they would hit at the same time in Canada. Why? Because in Canada, they measure temperature in Centigrade, not Fahrenheit. Water freezes at 0 degrees Celsius. So at 30 degrees Celsius and 45 degrees Celsius, both buckets are liquid.
That might be a valid argument if the the question did not specify Celcius or Fahrenheit. But the question did specify Fahrenheit.