5 m/sec or 300m / min
using speed = 
change 5 min 20 sec to seconds = (5 × 60) + 20 = 320 sec
speed =
= 5m / second or
speed = 60 × 5 = 300m / minute
Multiplying a side by a side by a side.(it's the same as a cuboid, but because all the side have the same length, you can simply cube a side to get the answer)
We know that
When we have

Here ,
a is the leading coefficient
c is the constant term
so, we can compare it with

so, we get

so,
leading coefficient is 5
constant term is 6......................Answer
The answer is all nonzero real numbers. I've had this problem before