Wang Shibo's home is 4 kilometers away from the factory. Usually he always walks to work. One day, because the factory has an urgent task, he runs fast for 1/3 of the distance, and the speed is 4 times the walking speed. 2 times the walking speed. In this way, Master Wang arrived 28 minutes earlier than usual. How far is Master Wang traveling?
王师博家到工厂有4千米，通常他总是步行上班，有一天因工厂有紧急任务，他前(1/3)路程快跑，速度是步行速度的4倍，后段路程慢跑，速度是步行速度的2倍．这样王师傅比平时早到28分钟，王师博行的途度是多少？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">4 / (4/5)</gadget>
<output>5</output>

<result>5</result>