project can be completed by team A alone in twice the time of team B and C working together, and team B alone can complete it in five times the time of team A and C working together. It is known that it will take Team A 10 days longer to complete the project than Team C alone. How many days will it take Team B to complete the project alone?
一件工程，甲队单独完成的时间是乙、丙合作完成时间的2倍，乙队单独完成的时间是甲、丙合作完成时间的5倍．已知甲队单独完成这项工程比丙队单独完成要多用10天．那么乙队单独完成这项工程要多少天？
<gadget id="calculator">2 * 30</gadget>
<output>60</output>

<result>60</result>