How do I calculate the final temperature of a particular point
 

Hello Everyone,
I have an assignment on two dimensional heat transfer.There is a temperature difference of 100 ° C between the upper and lower edges of a plate in the plane.I want to find the final temperature at any point with transient conditions.
For this, I tried to put a dot in geometry, but I could not succeed.I will be grateful if you could help me.
Have a nice day.

https://i.hizliresim.com/Eg3zdP.png