Lipika reads a book for 
hours every day. She reads the entire book in 6 days. How many hours in all were required by her to read the book?
It is given in the question that,
Number of hours Lipika reads the book = 1
= 
hours
Also,
Total days in which she completes the book = 6
Therefore,
Total number of hours required by her to complete the book = 
× 6
= 
= 10
hours
18