The passenger car and the truck drive in the opposite direction from the midpoint of A and B at the same time. After 3 hours, the bus arrives at A, and the truck is 30 kilometers away from B. It is known that the speed ratio of the bus and the truck is 4:3. How many kilometers apart.
客车和货车同时从甲乙两地的中点反向行驶，3小时后，客车到达甲地，货车离乙地还有30千米，已知客车与货车的速度比是4：3，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">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(1/2) * (3/4)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(1/2) - (3/8)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">30 / (1/8)</gadget>
<output>240</output>

<result>240</result>