Temperature different between two plate

[Askara]

can anyone tell me what formulae i can use to calculate the temperature of two plate?

eg i have a cement plate on top of a steel plate. each plate say 0.5cm thick. on one side of the cement plate is at 1000 degree c. in still air of room temperature 20 degree c. what's the temperature of the steel plate?

 

[Danger]

There is not nearly enough information in that question to even begin calculations.

 

[Askara]

i uploaded an image to explain better. but that information you need? it doesn't have to be a calculation, just a formula will do.