Answer: 9 Hours and 30 minutes.
Explanation:
on average Ms Johnson takes 15 minutes to mark one English assignment. So to find how long it takes to mark all 38 assignments, mulitply.
15(38)=570 minutes. The problem specifically states to answer in hours. 1 hour is 60 minutes.
570÷60= 9.5.
9 hours and half an hour,
which is 9 hours and 30 minutes.