car travels from place A to place B. The ratio of the distance traveled in 3 hours to the whole journey is 1:3. If it travels another 45 kilometers, it will reach the midpoint between places A and B. How many kilometers are there between places A and B?
一辆汽车从甲地到乙地，3小时行的路程和全程的比是1：3，如果再行45千米，正好到达甲乙两地的中点，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">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/2) - (1/3)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">45 / (1/6)</gadget>
<output>270</output>

<result>270</result>