Yangyang drives from Luoyang to Yanshi, the time speed of the whole journey (1/5) is 60km/h, the time speed of (3/10) is 80km/h, and the rest of the time speed is 50km/h, then the whole journey of Yangyang What is the average speed in km/h.
阳阳开车从洛阳去偃师，全程的(1/5)的时间速度为60km/h，(3/10)的时间速度为80km/h，其余时间速度为50km/h，则阳阳全程的平均速度为多少km/h．
<result>61</result>