From A to B, Li Ming has to travel for 5 hours, and Wang Hong has to travel for 4 hours. They both walk towards each other from A and B at the same time. After 2 hours, they are still 5 kilometers apart. The distance between A and B is How many kilometers?
从甲地到乙地，李明要行5小时，王红要行4小时，两人同时从甲、乙两地相向而行，2小时后他们还相距5千米，甲、乙两地相距多少千米？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">(1/5) + (1/4)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">(9/20) * 2</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 - (9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">5 / (1/10)</gadget>
<output>50</output>

<result>50</result>