Xiaofang typing 50 words per minute, Xiaoli typing 0.9 words per second, who typing fast?

Xiaofang typing 50 words per minute, Xiaoli typing 0.9 words per second, who typing fast?

Xiaoli! Xiaofang is 50 / 60 = 0.83, Xiaoli is 0.9, because 0.83 is less than 0.9, Xiaoli is fast. (it's hard to do it by herself, so, hehe)