Eli5 how do SLS and Space shuttle SRBs burn for the same time when SLS SRB has an extra segment?

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Wouldn’t SLS SRBs burn longer? Or is because the solid fuel burns from the inside out ie. not bottom to top?

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Anonymous 0 Comments

It’s all about surface area of the propellant in what is basically a hollow cylinder. Only what’s on that inside surface is currently burning, so control the surface area and you control how fast and thus how long it burns.

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