问一个超级简单的数学题~~~~~~~~~~~~

汪撕葱

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

谢谢大家

小油条

我觉得是前三分钟一共0.42吧