The railway

The railway line has a gradient of 12 per mille. How many meters will it ascend to a horizontal distance of 4 km?

Correct answer:

y =  48 m

Step-by-step explanation:

$$\begin{gathered} x=4\text{ km}\to \text{ m}=4\cdot 1000\text{ m}=4000\text{ m } \\ q=12\text{‰}={\displaystyle \frac{12}{1000}}=0.012 \\ y=q\cdot x=0.012\cdot 4000=48\text{ m} \end{gathered}$$

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