There's a table that says Company A charges $0.36 plus 0.03. And Company B charges $0.06 per minute. The question Im having problems with are:

Question

There's a table that says Company A charges $0.36 plus 0.03. And Company B charges $0.06 per minute. The question Im having problems with are: 
How long is a call that costs the same amount no matter which company is used? Be sure to show your thinking?

Damon · Answer

I assume you mean A is .36 + .03 per minute then A cost = .36 + .03 t B cost = .06 t they are the same when .36 + .03 t = .06 t or .03 t = .36 t = 12 minutes