The Elevator Problem

need a sorta formal writeup

15+10+10*n where n is the number of floors

Create a single sentence that calculates the time required for 10 people to go to floor n. 
Your sentence should:
-   be mathematically correct.
-   make your English teacher proud.
-   include units.
Optionally, create a second sentence that uses variables for loading time, unloading time, and travel time between consecutive floors.

To calculate the number of seconds required to reach floor \(n\), one must combine the ground loading time, the unloading time, and the travel time to create the formula: \((15+10+10n)s = (25+10n)s\) respectively.

Using variable times \(g\), \(u\), and \(r\) for ground loading, unloading, and travel time, the formula becomes: \(g+u+rn\)