Work out the time it would take her to complete one problem (time taken ÷ problems done) and then multiply that answer by the total number of problems to work out the total time.
So that would be:
25 minutes ÷ 20 problems = 1.25 problems per minute
1.25 problems per minute × 50 problems total = 62.5 minutes total.
The answer is: B) 62.5 minutes.
While both are tragedies caught by surprise, there are distinct differences between the two. The first is the culprit behind the tragedies. The bombing at Pearl Harbor was a surprise attack on the West Coast of the US organized by Japan. 9/11 was a surprise attack when planes flown by members of an Islamic terrorist group crashed into the twin towers and the Pentagon. Hope this helps!
