Q: The iPod on my iPhone plays at a fast speed, difficult to listen

Try to reset your device. This won't delete your data stored on this device.

• Press and hold the Sleep/Wake button
• Press and hold on the Home button
• Keep holding both buttons until the display turns off and back on with Apple logo on it.

Alternatively, you may go to Settings - General - Reset - Reset All Settings

I am having this problem and resetting the phone did not work for me either. Have you had any luck fixing the speed back to normal Tunog?

When you open your Podcast, you'll see in the bottom left corner something that says 1X.  In your case, it'll say 1 1/2x or 2x, etc.  Press this icon until you get back to 1X.  Hope this helps!!