Three blocks are placed in contact, as shown in the diagram below. Block X 1 poin- is initially 30°C, and block Z is initially 40°C. Heat energy flows from block Y
to both blocks X and Z. Which of the following is a possible initial
temperature of block Y?
Block X
30°C
Block Y
12
Block Z
40°C
20°C
30°C
40°C
50°C