Croatian height difference

There is a horizontal distance of 9 km between two cities on the Croatian coast. The road connecting these two cities has a climb of 13 per mille. What is the height difference between Croatian cities?

Final Answer:

h =  117 m

Step-by-step explanation:

$$\begin{gathered} x=9\text{km}\to \text{m}=9\cdot 1000\text{m}=9000\text{m} \\ q=13‰=\frac{13}{1000}=0.013 \\ h=q\cdot x=0.013\cdot 9000=117\text{m} \end{gathered}$$

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