Xiao Ming rides a bicycle from place A to place B. After driving the whole journey (2/5), he is still (7/2) kilometers away from the midpoint. How many kilometers are there between A and B?
小明骑车从甲地到乙地，行了全程的(2/5)后，离中点还有(7/2)千米．甲乙两地相距多少千米？
<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) - (2/5)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(7/2) / (1/10)</gadget>
<output>35</output>

<result>35</result>