###Human: Barbara Blackburn can type 212 words per minute.  Due to Carpal tunnel syndrome, Barbara cannot use her left hand for a while so her typing speed is now 40 words less per minute. If she is supposed to type a document with 3440 words, how many minutes will it take her to finish typing the document?, ### Assistant: Due to carpal tunnel syndrome, Barbara can only type 212 - 40= 172 words per minute.
So, she will be able to finish typing the document in 3440/172 = 20 minutes. 
 So the answer is :  20