Sushant reads 1/4 part of a book in 1 hour. How much part of the book will he read in 21/5 hour?

Sushant reads 1/4 part of a book in 1 hour. How much part of the book

1.	Sushant reads 1/4 part of a book in 1 hour. How much part of the book will he read in 21/5 hour?
Answer» 21/20 part