900 meters
nine hundred。对于hundred，只要前面是数字，就是hundred。后面加s的只有hundreds of。
详解：
nine hundred
[词典] 九百;
[例句]The city had been besieged by German Fascist gangsters and their accomplices forover nine hundred days and nights.
这座城市被法西斯匪徒和他们的仆从们围困了900多个昼夜。
900米的英文写为，900 meters。
