$12 \times (3 - 1) = 24$ 
Joe lives on the $3$\textsuperscript{rd}~floor. He needs to spend $12$ minutes to move from the $4$\textsuperscript{th} floor to the $5$\textsuperscript{th} floor. How many minutes does he need to climb from the $1$\textsuperscript{st} floor to the $3$\textsuperscript{rd} floor? 
* $$12$$ 
* $$24$$ 
* $$36$$ 
* $$48$$ 
* $$60$$ 