A manuscript can be typed by Xiaohong alone in (2/5) hours, and it can be completed by Xiao Liu in 15 minutes alone. Now how many hours can it be completed by two people working together?
一份稿件，由小红单独打，(2/5)小时完成，由小刘单独打15分钟可以打完，现在两人合打多少小时才能完成．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / (2/5)</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / (1/4)</gadget>
<output>4</output>

<gadget id="calculator">(5/2) + 4</gadget>
<output>13/2 = around 6.5</output>

<gadget id="calculator">1 / (13/2)</gadget>
<output>2/13 = around 0.153846</output>

<result>2/13 = around 0.153846</result>