The speed of the maglev train can reach 430km per hour, which is 40km more than three times that of ordinary trains. How many kilometers per hour is the speed of ordinary trains?
磁悬浮列车运行速度每时可达430km，比普通火车的3倍还多40km，普通火车的速度是每时多少千米？
<result>70</result>