Ms. B and Ms. D are writing problems for an algebra book. Ms. B started with $10$ problems already written, and she can write $6$ problems an hour. Ms. D had no problems written, but she writes $10$ problems an hour.  

1. When will Ms. B have the same number of problems written as Ms. D?

   Hint (a):

   Use the Equal Values Method by setting the equations equal to each other and solving for x to find the time.

2. How many problems will they each have written at that time?

   Hint (b):

   Substitute $x$ into either of the original equations above and solve for $y$ to find how many problems they will each have written at that time.