题目

We were caught in the heavy traffic jam. Otherwise, we _____ on time.   A. would have arrived                        B. arrived   C. must have arrived                         D. should arrive 答案:A一辆客车在某高速公路上行驶,在经过某直线路段时,司机驾车保持速度不变.司机发现其正要通过正前方高山悬崖下的隧道,于是鸣笛,5s后听到回声;听到回声后又行驶10s司机第二次鸣笛,3s后听到回声.请根据以上数据帮助司机计算一下客车的速度,看客车是否超速行驶.已知此高速公路的最高限速为110km/h(如图所示),声音在空中的传播速度为340m/s.
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