To build a canal with a length of 1,800 meters, team A builds 56.5 meters every day, team B builds 63.5 meters every day, and both teams build it at the same time. How many days can it be completed?
修一条长1800米的水渠，甲队每天修56.5米，乙队每天修63.5米，两队同时修，多少天可以修完？
<gadget id="calculator">56.5 + 63.5</gadget>
<output>120</output>

<gadget id="calculator">1_800 / 120</gadget>
<output>15</output>

<result>15</result>