Bandwidth Requirement

If a school teacher asks a question of 30 students and they all post on TR. How many points does the question need to assign in order to warrant a response if the users are connected at 700kbps?

Ok, I will take a shot at doing the math here.
The T1 line is the choke point in the equation.

10M filesize is 10,000,000 bytes. X 8 bits per byte = 80,000,000 bits.
T1 is 1.54 Mbits or 1,540,000 bits
80,000,000/1,540,000=51.948051948051948051948051948052 or 52 seconds (rounding up) at full saturation.

Since this is close to a solid minute to move the file if you used the full capacity of the T1, then just divide the total T1 bandwidth by 15 to get a rough estimate of how much bandwidth you would need to move the 10MB file in 15 minutes:

So, divide the 1.54Mbit connection by 15 to get 102666 bits (102K)

This is a rough estimate, and it does not count any OTHER traffic running on the line. Other traffic will decrease this performance. But, in a perfect world, these are the numbers.