A truck and a bus run towards each other from east to west at the same time. The truck travels 48 kilometers per hour, and the bus travels 42 kilometers per hour. The two vehicles meet at a distance of 18 kilometers from the midpoint. Find the distance in kilometers between the east and west places.
货车和客车同时从东西两地相向而行，货车每小时行48千米，客车每小时行42千米，两车在离中点18千米处相遇，求东西两地相距多少千米．
<gadget id="calculator">48 - 42</gadget>
<output>6</output>

<gadget id="calculator">2 / 6</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">48 + 42</gadget>
<output>90</output>

<gadget id="calculator">18 * (1/3) * 90</gadget>
<output>540</output>

<result>540</result>