The bus and the truck drive in opposite directions from the midpoint of towns A and B at the same time. After 3 hours, the bus arrives at town A, and the truck is still 30 kilometers away from town B. It is known that the speed of the truck is (3/4) the speed of the passenger car. How many kilometers are the distance between towns A and B?
客车与货车同时从甲、乙两镇的中点向相反的方向行驶，3小时后，客车到达甲镇，货车离乙镇还有30千米．已知货车速度是客车速度的(3/4)，甲、乙两镇相距多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) / 3</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(1/6) * (3/4) * 3</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>