car drives from A to B, if it travels 90 kilometers per hour, it can arrive 0.5 hours earlier, if it travels 60 kilometers per hour. Then it will arrive 0.5 hours late. How many kilometers are there between A and B?
一辆汽车从甲地开往乙地，如果每小时行驶90千米，那么可提前0.5小时到达，如果每小时行驶60千米．那么将晚0.5小时到达．甲、乙两地相距多少千米？
<gadget id="calculator">1 / 180</gadget>
<output>1/180 = around 0.005556</output>

<gadget id="calculator">1 / (1/180)</gadget>
<output>180</output>

<result>180</result>