Volunteer put together 40 school supply kits in 8 minutes. At this rate how many could they put together in 30 minutes? Solve this using a unit rate.
To find the number of school supply kits that could be put together in 30 minutes, we need to determine how many kits are put together in 1 minute, and then multiply that by 30.
If the volunteer puts together 40 school supply kits in 8 minutes, then they put together 40/8 = <<40/8=5>>5 kits in 1 minute.
So, the volunteer could put together 5 kits in 1 minute.
Therefore, the volunteer could put together 5 x 30 = <<5*30=150>>150 school supply kits in 30 minutes. Answer: \boxed{150}.