Answered

On December 24, 1924, the temperature in Fairfield, Montana, fell from
63
°
F
63
⁢
°
⁢
F
at noon to
−
21
°
F
-
21
⁢
°
⁢
F
at midnight. What was the average temperature change per hour?

Answer :

42 lost because it then goes form high to low

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