A truck travels 50 kilometers per hour from place A to place B, and it takes 2.4 hours to arrive. If the speed is increased (1/5), how many hours earlier can it arrive?
货车从甲地开往乙地每小时行50千米，2.4小时可以到达，如果速度提高(1/5)，可以提前几小时到达？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">50 * (6/5)</gadget>
<output>60</output>

<gadget id="calculator">2.4 / 60</gadget>
<output>0.04</output>

<gadget id="calculator">50 * 0.04</gadget>
<output>2</output>

<gadget id="calculator">2.4 - 2</gadget>
<output>0.4</output>

<result>0.4</result>