Zhang Ping and Wang Liang start from A to B at the same time by bicycle. Zhang Ping travels 18 kilometers per hour, and Wang Liang travels 15 kilometers per hour. Zhang Ping stopped for 2 hours on the way because of something, so he arrived 1 hour later than Wang Liang. How many kilometers are the distance between A and B?
张平、王亮从甲地到乙地，同时骑自行车出发，张平每小时行18千米，王亮每小时行15千米．张平因事在途中停了2小时，所以比王亮晚到1小时，甲乙两地相距多少千米？
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / 18</gadget>
<output>1/18 = around 0.055556</output>

<gadget id="calculator">(1/15) - (1/18)</gadget>
<output>1/90 = around 0.011111</output>

<gadget id="calculator">1 / (1/90)</gadget>
<output>90</output>

<result>90</result>