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B. C. D. 如图，铁路 MN 和公路 PQ 再点 O 处交汇∠ QON=30° ，公路 PQ 上 A 处距离 O 点 240m ，火车行驶时周围 200 以内会受到噪音的影响，那么火车在铁路 MN 上沿 ON 方向，以 72 千米每小时的速度行驶， A 处受噪音影响的时间约为多少秒？（精确到 0.1s) (A) 12 秒 (B) 16 秒 (C) 20 秒 (D) 24 秒. N. P. O. M. A. Q.

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  1. B C D 如图，铁路MN和公路PQ再点O处交汇∠QON=30°，公路PQ上A处距离O点240m，火车行驶时周围200以内会受到噪音的影响，那么火车在铁路MN上沿ON方向，以72千米每小时的速度行驶，A处受噪音影响的时间约为多少秒？（精确到0.1s) (A) 12秒 (B) 16秒 (C) 20秒 (D) 24秒 N P O M A Q

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