There is a batch of goods, which can be transported by team A in 15 hours and team B in 12 hours. The two teams transported together for 5 hours, and exactly 45 tons were transported. How many tons is this shipment?
有一批货物，甲队独运15小时运完，乙队独运12小时运完．两队合运5小时，正好运了45吨．这批货物有多少吨？
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/15) + (1/12)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(3/20) * 5</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">45 / (3/4)</gadget>
<output>60</output>

<result>60</result>