The figure shows a graph of the temperature of a pure substance as a function of time as heat is added to it at a constant rate in a closed container. If is the latent heat of fusion of this substance and is its latent heat of vaporization, what is the value of the ratio 
A) 4.5
B) 7.2
C) 1.5
D) 3.5
E) 5.0
Correct Answer:
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