Mastering Mandarin 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 Mandarin in China, Brunei, Cambodia, Hong Kong, Indonesia, Laos, Malaysia, Mauritius, Mongolia, Philippines, Russia, Singapore, Taiwan, Thailand, United Kingdom, USA, and Viet Nam.
Number of native speakers is about 910,000,000.
Number of fluent speakers is about 990,000,000. The biggest country in which Mandarin is used as a native language is People’s Republic of China (PRC).
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..
Mandarin came from Sino Tibetan language family.
Mon-Khmer branch of the Austroasiatic language family is the origin of Khmer language.