Europe, Asia, and Africa.
The meridian 40 degrees EAST of Greenwich:
Europe
Asia
Africa
Antarctica
The meridian 40 degrees WEST of Greenwich:
South America
Antarctica
40 degrees south passes through the continents of Australia, South America, and Africa.
It is a parallel 40 degrees north of the equator. Along this latitude is the United States in the Western Hemisphere. In Europe, it runs through Portugal, Spain, Sardinia, mainland Italy, Albania, and Greece. In Asia, it passes through Turkey, Armenia, Azerbaijan, Turkmenistan, Uzbekistan, Kyrgyzstan, northern China, North Korea, and Japan.
The 60 degrees east line of longitude runs through the Ural Mountains.
The latitude 54 degrees 40 minutes north runs through parts of Northern Europe, including countries like the United Kingdom, Norway, and Sweden.
The coordinates 40 degrees north and 100 degrees east correspond to Asia.
south America & Australia
Yes, it passes through Colorado well north of Denver.
International Date Line passes through these co-ordinates.
Two countries through which the 30 degrees south line of latitude passes are Australia and New Zealand. It passes through several other countries as well.
The lines that pass through the USA are 30 and 40 degree lines
Indiana extends from (just south of) 38 degrees north to (just south of) 42 degrees north. The full degree latitude closest to the midpoint is 40 degrees north.
40 degrees due north of Tennessee is somewhere on pack ice on Ellesmere Island in Nunavut. 40 degrees due south of Tennessee puts you in the Pacific Ocean off the coast of Peru. The 40th parallel of north latitude passes through Illinois, Indiana, Ohio, and Pennsylvania, but not through Tennessee. It's really a mystery what the question is asking for.
40 degrees
It is a parallel 40 degrees north of the equator. Along this latitude is the United States in the Western Hemisphere. In Europe, it runs through Portugal, Spain, Sardinia, mainland Italy, Albania, and Greece. In Asia, it passes through Turkey, Armenia, Azerbaijan, Turkmenistan, Uzbekistan, Kyrgyzstan, northern China, North Korea, and Japan.
The meridian of 40° west longitude passes through Greenland, the Atlantic Ocean, the eastern tip of Brazil, and Antarctica. It doesn't come anywhere the Caribbean.
-40
Tirana, Albania