How universe is 150 billion light years wide while the maximum speed is light speed?

Because somebody is lying to you.

Even if your supposition were correct and the universe is 13.75 billion yrs old the width of the universe would most certainly NOT be 13.75 billion light years unless its expansion were only one sided. It would be 13.75 billion light years in RADIUS not diameter.

The speed of light is the limit on how fast things can move through space. It has nothing to say about how fast space itself is allowed to expand over time.

Space is able to expand at a speed which is greater than the speed of light so the width of the universe is not equal to how old it is.

Space can expand faster than light. Light is the cosmic speed limit through space. The 150 billion light years dimension applies to the observable universe which has expanded beyond the limit of 13.72 billion light years we can now observe, which as you say is dependent on the time and speed of light since the big bang. Inflationary Theory would have it that the universe is far greater than 150 billion light years in diameter, indeed many orders of magnitude greater (maybe infinite), but space has expanded this extended zone far beyond our observational limits and the light from there will never reach us. If dark energy is accelerating the expansion rate of space within the observable universe, then less and less of it will be visible to our telescopes in the far future, until only our local gravitationally bound cluster of galaxies remain.

Light years is a unit of distance, not time. You also are forgetting that you need to double the radius of circle/sphere to get the diameter, so the diameter of the Universe is 13.75 x 2 = 27.5 billion light years wide. Is the web site you found the 150 billion light years wide figure on scientifically reliable? I bet you a cup of coffee or tea that it is not scientifically reliable. Lots of people make their own web-sites and can put anything they want on that web-sit. That does not mean what they put on that web-site is true, accurate, or factual.