<PRE><B>Question 310698</B>
This question just involves some multiplication and division.


There are 10 words per line, 25 lines per page, 12 pages, and 15 documents


Number of total words = (15 docs) * (12 pages /doc) * (25 lines/ page) * (10 words/ line)

Number of total words = (15*12*25*10)= 45000


Time taken = Total words / words per minute 
Time taken = 45000 / 40
Time taken = 1125 minutes


To convert to hours, divide by 60.  1125 minutes = 18.75 hours.</PRE>