The charge for a telephone call between City R and City S is $0.42 for each of the first 3 minutes and $0.18 for each additional minute. A certain call between these two cities lasted for x minutes, where x is an integer. How many minutes long was the call?
请问each of the first 3 minutes 是说前三分钟一共是0.42 还是说前三分钟，每一分钟是0.42呢
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发表于 2018-3-15 15:44:06
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