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Math 40 minutes
If you ask students what the activity time is, yes,

40× 2/8 = 10 (minutes)

It is concluded that the student activity time is 10 minute;

If you're asking how much time there is besides student activities, yes,

40×( 1- 2/8 )=30 (minutes)

It is concluded that there are still 30 minutes besides the student activity time.

I hope I can help you _