Mastering Arabic will take from you 2200 hours or 88 weeks in a class according to FSI. Difficulty category for mastering it is evaluated 3 point.
Learning Khmer might seem like a overwhelming thing to do. FSI has concluded that it takes 1100 hours or 44 weeks in a class to learn the language. The difficulty point is 2.
You will most likely find people, who speaks Arabic in Saudi Arabia, Algeria, Bahrain, Chad, Djibouti, Egypt, Iraq, Jordan, Kuwait, Lebanon, Libya, Morocco, Oman, Palestinian West Bank and Gaza, Qatar, Somalia, Sudan, Syria, Tunisia, Mauritania, United Arab Emirates, and Yemen.
Number of native speakers is about 15,000,000.
Number of fluent speakers is about 10,000,000. The biggest country in which Arabic is used as a native language is Saudi Arabia.
Native speakers of Khmer are mostly from Cambodia and are about 13,000,000 people.
Khmer are spoken fluently by 15,000,000 people.
The language is spoken in Cambodia, Vietnam, Thailand, Canada, China, France, Laos, USA..
Arabic came from Semitic family of languages.
Mon-Khmer branch of the Austroasiatic language family is the origin of Khmer language.