car travels from place A to place B at a speed of 40 kilometers per hour. It takes 4 hours to travel the entire distance (2/5). How many hours will it take to complete the journey? (answer in two ways)
一辆汽车以每小时40千米的速度从甲地行向乙地，4小时行了全程的(2/5)，行完全程还要几小时？(用两种方法解答)
<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">(2/5) / 4</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(3/5) / (1/10)</gadget>
<output>6</output>

<result>6</result>