Wang Xin rides a bicycle at a speed of 15 kilometers per hour. If riding a car takes 3 minutes less per kilometer than riding a bicycle, then how many times the speed of the car is the speed of the bicycle.
王新骑自行车的速度是每小时15千米，如果乘汽车每1千米比骑自行车少用3分钟，那么汽车的速度是自行车的速度的多少倍．
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