If I am hiding and moving silently at the same time, what is my total movement penalty?


In D&D 3.5, according to page 79 of the PHB under the move silently skill:

You can move up to one-half your normal speed at no penalty. When moving at a speed greater than one-half but less than your full speed, you take a –5 penalty.

And, according to page 76 of the PHB under the hide skill:

You can move up to one-half your normal speed and hide at no penalty. When moving at a speed greater than one half but less than your normal speed, you take a –5 penalty.

Assuming:

  • I have no special abilities that have any relevance to this circumstance

  • I am able to move silently and hide in the same round

  • I wanted to do this without incurring a penalty on my skill checks

  • My normal movement speed is 30ft

Would my speed, which I have opted to reduce, be to 15ft or would it be 7.5ft?