如图，一辆汽车的位置在第2列第2行表示为（2，2），3小时后，汽车的位置在（11，2）．
（1）在图中分别标出汽车两次所在的位置．
（2）如果图中每格的距离代表24千米，这辆汽车每小时行多少千米？（假设汽车一直在一条直线上沿一个方向行走）
（3）如果汽车从位置（11，2）再向北行驶l小时，将汽车所在位置用数对表示出来，并在图中标出来．
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