The passenger car and the truck travel in opposite directions from the midpoint between A and B at the same time. After 3 hours, the bus arrives at A city, and the truck is still 30 kilometers away from B city. It is known that the speed of a truck is (3/4) that of a passenger car. How many kilometers is the distance between A and B?
客车和货车同时从甲、乙两城之间的中点向相反的方向相反的方向行驶，3小时后，客车到达甲城，货车离乙城还有30千米．已知货车的速度是客车的(3/4)，甲、乙两城相距多少千米？
<gadget id="calculator">30 * 4 * 2</gadget>
<output>240</output>

<result>240</result>