If the population of a certain country increases at the rate of one person every 15 seconds, by how many persons does the population increase in 60 minutes?
Choose the most appropriate option:
A) 80 B) 100 C) 150 D) 240 E) 300
Since the population increases at the rate of 1 person every 15 seconds, it increases by 4 people every 60 seconds, that is, by 4 people every minute. Thus, in 60 minutes the population increases by 60 x 4 = 240 people.   Answer. 240.
<result>D</result>
If the population of a certain country increases at the rate of one person every 15 seconds, by how many persons does the population increase in 60 minutes?