Zhang Jun and Li Hua practiced long-distance running. Zhang Jun ran for 30 minutes. Li Hua's speed was twice that of Zhang Jun, and the distance he ran was three times that of Zhang Jun. How many minutes did Li Hua run?
张军与李华练习长跑，张军跑了30分钟，李华的速度是张军的2倍，跑的路程是张军的3倍，李华跑了多少分钟？
<result>45</result>