The value of x is about 4.7
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Here is the graphical representation of the function you provide.
You can see the the points in which the line intersects each axis.
Every point in the line is a possible option for which hot dog package was bought.
For example, Taro might have bought 0 of the packages of 8, and 16 packages of 12.
or He might've bought zero packages of 12, and 24 packages of 8.
8 is missing for the table
Since 1 km = 1000 m, the lawnmowers top speed would be 8000 m/h.