A passenger ship sails from port A to port B. After 1.2 hours, a freighter sails from port B to port A. The freighter takes 12 hours to complete the journey. It meets the passenger ship at the point of 2/5. After the encounter, how many hours will the passenger ship have to drive to reach Port B?
一艘客轮从甲港开往乙港，行1.2小时后，一艘货轮从乙港开往甲港，货轮行完全程要12小时，它行至全程(2/5)处与客轮相遇．相遇后，客轮还要行驶几小时到达乙港？
<gadget id="calculator">4.8 + 1.2</gadget>
<output>6</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">6 / (3/5)</gadget>
<output>10</output>

<gadget id="calculator">10 - 6</gadget>
<output>4</output>

<result>4</result>