To find out how much propellant each space shuttle solid rocket motor burns in 30 seconds, you can set up a proportion based on the given information:
1. The motor burns 680,400 kilograms of propellant in 2.5 minutes.
2. You want to find out how much propellant it burns in 30 seconds.
Let's set up the proportion:

First, convert 2.5 minutes to seconds (since there are 60 seconds in a minute):
2.5 minutes = 2.5 * 60 seconds = 150 seconds
Now, plug in the values:

Now, solve for the amount burned in 30 seconds:

So, each space shuttle solid rocket motor burns 4,081,600 kilograms of propellant in 30 seconds.