Xiao Ming has two roads with the same length from home to school, one is flat road, the other is half uphill and half downhill. It takes Xiao Ming the same amount of time to go to school by the two roads. If the speed of going downhill is twice that of a flat road, how many times faster is the speed of going uphill than that of a flat road?
小明从家到学校有两条一样长的路，一条是平路，另一条是一半上坡路、一半下坡路．小明上学走两条路所用的时间一样多．已知下坡的速度是平路的2倍，那么平路的速度是上坡的多少倍．
<result>1.5</result>