A car drives from place A to place B. It has traveled the entire distance (3/5) and exceeds the midpoint by 30km. How many kilometers are there between places A and B?
一辆汽车从甲地开往乙地，已行了全程的(3/5)，超过中点30km，甲、乙两地相距多少千米？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

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

<gadget id="calculator">(3/5) - (1/2)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">30 / (1/10)</gadget>
<output>300</output>

<result>300</result>