A car has traveled 40% of the journey from A to B, and if it travels another 15 kilometers, it will reach the midpoint between the two places. How many kilometers are there between A and B?
一辆汽车从甲地开往乙地，已经行了全程的40%，如果再行15千米就到达两地的中点．甲乙两地相距多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">40 / 100</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">15 / (1/10)</gadget>
<output>150</output>

<result>150</result>