Two people, A and B, set off from point a to point b at the same time. After arriving at point b, A immediately returns on the same road and meets B at a distance of 24 kilometers from point b. It is known that A travels 54 kilometers per hour, and B travels 42 kilometers per hour. How many kilometers are there between a and b?
甲、乙两人同时从a地出发到b地，甲到b地后立即原路返回，在距b地24千米处与乙相遇．已知甲每小时行54千米，乙每小时行42千米，a、b两地相距多少千米？
<gadget id="calculator">24 * 2</gadget>
<output>48</output>

<gadget id="calculator">54 - 42</gadget>
<output>12</output>

<gadget id="calculator">48 / 12</gadget>
<output>4</output>

<gadget id="calculator">54 * 4</gadget>
<output>216</output>

<gadget id="calculator">216 - 24</gadget>
<output>192</output>

<result>192</result>