The distance between A and B is 1230 kilometers. A passenger car is driven from city A to city B, driving 90 kilometers per hour. After 2 o’clock, a truck is driven from city B to city A, driving 120 kilometers per hour. m, how long does it take for the truck to meet the passenger car?
甲、乙两城相距1230千米，从甲城往乙城开出一辆客车，每时行驶90千米，2时后，从乙城往甲城开出一辆货车，每时行驶120千米，货车开出几时后与客车相遇？
<gadget id="calculator">90 * 2</gadget>
<output>180</output>

<gadget id="calculator">1_230 - 180</gadget>
<output>1_050</output>

<gadget id="calculator">90 + 120</gadget>
<output>210</output>

<gadget id="calculator">1_050 / 210</gadget>
<output>5</output>

<result>5</result>