If the inspection time is equal to the mouth time, then
If Xiaoming does English first, they will wait 10 minutes.
It will take 20 minutes to do math again, which means that English has been checked, so it will take 20 minutes for two semesters.
And so on, in the end, two people waited for 30 minutes.
Then it is 20+40+60= 120 minutes.
If the order is Math-English-Chinese
Waiting for math is 20×2, and then one person will check it, and English is 10. Because there is only one person left, it has been 10 minutes since the check has been finished, so two people will check it at the same time, and the language will be completed 10 minutes, so the last two semesters will be 20×2.
The total is 40+ 10+40=90.
Mathematics-Chinese-English
20×2, after which one person checks and the other person continues to wait. Because Chinese is 30 minutes, we still have to wait 10 minutes after the math test, and the total * * * is 30+ 10. After that, one person will check, and the other person will wait in English for 65,438+00 minutes. There is no need to wait for the direct person for 65,438+00 minutes.
The total * * * is 40+40+ 10, which is also 90 minutes.
The order is Chinese-Math-English.
Chinese is 30×2, one person checks, mathematics is 20, Chinese is left 10 minutes, English just finished checking, Chinese needs 10 minutes, mathematics is still being checked, so there is no need to wait.
The total is 60+20=80.
Chinese-English-Mathematics
The waiting time for Chinese is 30×2, one person will check it, English will wait 10, and the rest will check it. Chinese will be finished in the remaining 20 minutes, and math will take 20 minutes. Those who look up Chinese have to wait 10 minutes.
Comprehensive 60+ 10+ 10=80.
English-Chinese-Mathematics
After English 10×2, you need a person to check the language. Because it takes 30 minutes, English speakers have to wait 20 minutes, and two semesters are 30+20. Chinese needs to be checked by one person, and math needs 20 minutes. Because the language check is not played, only one person has to wait for 20 minutes.
Comprehensive 20+50+20=90
On the whole,
Two 80-minute ones are the ones that wait the least.