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Mathematics
Problem
At 6:00 AM the air temperature at a campsite was
12
∘
C
12\,^{\circ}\text{C}
12
∘
C
. By 2:00 PM it had reached
28
∘
C
28\,^{\circ}\text{C}
28
∘
C
. Assuming temperature varies continuously with time, explain why there must have been a moment between 6:00 AM and 2:00 PM when the temperature was exactly
20
∘
C
20\,^{\circ}\text{C}
20
∘
C
.
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