The equation you've written, \( t = h(m + r) \), seems to represent a relationship between several variables: \( t \), \( h \), \( m \), and \( r \). Depending on the context, these variables could represent quantities in various fields such as physics, economics, or mathematics.
To help you further, could you provide more context or specify what you would like to know about this equation? For example, are you looking for a solution for one of the variables, or do you need an explanation of the relationship it represents?