There is a road between the gymnasium and the school, and it takes 30 minutes for a car to go back and forth. One day, the basketball game ended at 4:00 p.m., and the students walked back to the school immediately along the road. They get on the bus immediately and arrive at the school at 4:50, so how many times the speed of the car is the walking speed of the students.
体育馆和学校之间有一条马路，汽车往返需要30分钟，某日篮球赛在下午4点结束，学生们立即沿马路步行返回学校，途中遇到4点30分从学校开出接他们的汽车，他们立即上车，在4点50分到达学校，那么汽车的速度是学生步行速度的多少倍．
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