The speeds of the car, the van and the bus are 60 km/h, 48 km/h and 42 km/h respectively. The car and the bus depart from A and the van from B at the same time. 30 minutes after the car came across a bus. Question: How many miles is the distance between A and B?
小轿车、面包车和大客车的速度分别为60千米/时、48千米/时和42千米/时，小轿车和大客车从甲地、面包车从乙地同时相向出发，面包车遇到小轿车后30分又遇到大客车．问：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">48 + 42</gadget>
<output>90</output>

<gadget id="calculator">48 / 90</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">60 + 48</gadget>
<output>108</output>

<gadget id="calculator">48 / 108</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(8/15) - (4/9)</gadget>
<output>4/45 = around 0.088889</output>

<gadget id="calculator">(1/2) / (4/45)</gadget>
<output>45/8 = around 5.625</output>

<gadget id="calculator">48 * (45/8)</gadget>
<output>270</output>

<result>270</result>