[計量] 請教一題
In a certain country, a person is born every 3 seconds and a person
dies every 10 seconds. Therefore, the born and death rates account for
a population growth rate of one person every
(A) 3 and 1/3 sec
(B) 4 and 2/7 sec
(C) 7 sec
(D) 11 and 2/3 sec
(E) 13 sec
ANS: (B)
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