Final answer:
Gottlieb Daimler, a German inventor, along with his partner Wilhelm Maybach, developed the first high-speed internal combustion engine in 1885, paving the way for modern automotive technology.
Step-by-step explanation:
The German inventor who developed the first high-speed internal combustion engine is Gottlieb Daimler. Daimler, along with his partner Wilhelm Maybach, designed this engine in 1885. This invention was groundbreaking, as it allowed for the development of smaller, faster, and more efficient engines, which eventually led to the invention of the modern-day automobile.
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