Long hot dog

In Kostelec above Black Forest, they made a record-long hot dog. When slowly moved it to the square, one of the spectators decided to measure its length: the size of his footprint is 28 cm; he measured 20 feet in travel direction, counted 5 feet against the direction. How long was the hot dog?

Correct result:

X =  350 cm

Solution:

$$\begin{gathered} s=28\text{ cm } \\ y=v_{2}t \\ x+y=20 \\ x-y=5 \\ x+y=20 \\ x-y=5 \\ x={\displaystyle \frac{25}{2}}=12.5 \\ y={\displaystyle \frac{15}{2}}=7.5 \\ X=s\cdot x=28\cdot 12.5=350\text{ cm} \end{gathered}$$

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