The sailboat travels 0.18 kilometers per minute, the motorboat travels 0.62 kilometers per minute, and both boats travel for 8.5 minutes. How many kilometers have they traveled in total?
帆船每分钟行驶0.18千米，摩托艇每分钟行驶0.62千米，两种船都行驶8.5分钟，一共行驶了多少千米？
<gadget id="calculator">0.18 + 0.62</gadget>
<output>0.8</output>

<gadget id="calculator">0.8 * 8.5</gadget>
<output>6.8</output>

<result>6.8</result>