Two cleaning vehicles, A and B, clean the east and west streets. It takes 10 hours for vehicle A to clean alone, and 15 hours for vehicle B to clean alone. The two vehicles clean from opposite sides of the street at the same time. When they meet, vehicle A cleans 1.2 kilometers more than vehicle B. How many kilometers is the total length of Dongxi Street?
甲、乙两辆清洁车清扫东西大街，甲车单独清扫需要10小时，乙车单独清扫需要15小时，两车同时分别从大街一端相向清扫，相遇时甲车比乙车多清扫1.2千米，东西大街全长多少千米？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

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

<gadget id="calculator">(1/10) + (1/15)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / (1/6)</gadget>
<output>6</output>

<gadget id="calculator">(1/10) * 6</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(1/15) * 6</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/5) - (2/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1.2 / (1/5)</gadget>
<output>6</output>

<result>6</result>