A car has traveled the whole distance (3/5), and it has exceeded the midpoint by 15 kilometers. How many kilometers is the whole journey?
一辆汽车行了全程的(3/5)，这时已超过中点15千米，全程多少千米？
<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">15 / (1/10)</gadget>
<output>150</output>

<result>150</result>