Borrowing bicycle

Jacob lent a bicycle to friends who wanted to ride it. For a three-hour bike ride, Jacob received two chocolates. Yup. If you wanted a bike for 2 hours, you had to give Jacob 12 candies. Peter gave Jacob 1 chocolate and three candies. How long can Peter ride Jacob's bicycle?

Result

t = 2:00 h

Step-by-step explanation:

$$\begin{gathered} c_1=3/2=\frac{3}{2}=1.5 \\ {c}_2=2/12=\frac{1}{6}\doteq 0.1667 \\ t=1\cdot c_1+3\cdot c_2=1\cdot 1.5+3\cdot 0.1667=2=2:00\text{h} \end{gathered}$$

Try another example