It makes readers think about how long Ellery usually takes to solve a case.
It makes readers worry that they won’t have time to read the mystery.
It makes readers wonder how long it will take Ellery to solve the mystery.
It makes readers curious as to why the teacher is so worried.

It makes readers think about how long Ellery usually takes to solve a case.

Explanation:

The insistence of one person being worried and looking at the clock is that the investigators are running late and it could be due to a variety of reasons.

They could be in grave danger or there is an imminent threat of something else happening around them as they focus on this case.

The other person tells him smugly that the detective still has 28 minutes to solve the case.

This sentence insinuates that the detective usually only takes that much time to solve the case, showing the speaker's confidence in his abilities.

resents dr jekyll

explanation:

that is the answer

for this case, we must find the number of deaths per day of the year 2015, in automobile accidents, knowing that 32,400 people died.

knowing that the year 2015 had 365 days we have the following division:

where "x" represents the number of deaths per day.

rounding off we have:

approximately, 89 people per day died in 2015

answer:

89 people per day