A certain project can be completed in 12 days if teams 1, 2, and 3 work together; if teams 1, 3, and 5 work together, it can be completed in 7 days; if teams 2, 4, and 5 need 8 days to complete, then teams 4. Four teams working together can complete it in 42 days, so how many days will it take for 5 teams to work at the same time?
某工程如果由一、二、三队合干需用12天可以完成，如果一、三、五队合干需要7天可以完成，如果二、四、五小队需要8天完成，由一、三、四队合干42天可以完成，那么5个队同时干需要多少天完成．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

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

<result>6</result>