A Metal Bar Is Used to Conduct Heat $\degree$ C and at the Other Is 20

Multiple Choice

A metal bar is used to conduct heat. When the temperature at one end is 100 $\degree$ C and at the other is 20 $\degree$ C, heat is transferred at a rate of 16 J/s. If the temperature of the hotter end is reduced to 60 $\degree$ C, what will be the rate of heat transfer?

A) 4 J/s
B) 8 J/s
C) 9 J/s
D) 12 J/s