Respuesta :

0.375 of a book in an hour
if he reads 1/4 of a book in 2/5 of an hour
he will read 0.625 of a book in an hour, or 5/8 of a book.
solve it with a proportion
1/4 of a book : 2/5h = X : 1h
X = (1/4)/(2/5) = 5/8