To get the fraction of news papers delivered in the second hour we proceed as follows:
fraction delivered in the first hour=3/8
Remaining fraction is (1-3/8)=5/8
Given that in the second hour he delivered 4/5 of 5/8, then the fraction delivered in the second hour will be:
4/5 of 5/8
=4/5×5/8
=1/2
He delivered 1/2 of the papers in the second hour.