http://science.howstuffworks.com/science-vs-myth/everyday-myths/time3.htm<br />
<br />
It is asking for where the universal time is. It matches up with a specific time zone. Above link is explaination and answer. Once you understand the question, it's just seeing what matches up. Nothing special, as far as I see.<br />
<br />
Its's were UTC is 0, not adding or subtracting hours. It's where the rest of the time zones "start", like zero on a number line. They decrease or increase depending on which way they go.

Oooh, good question... If you have a globe, (Who does) you can see that the width gets smaller as you get farther from the equator... So... you have to ask yourself... What unit of measurements. If you use a distance unit... the number with change as you move... There is an other unit of measure... where the number will stay the same.... and it has to do with navigation... all the hints this old sailor is willing to give right now.

Two things... The question was edited... the first version asked for width....
And... degrees is not a measurement of width...

Earth is divided into twenty-four time zones of approximately equal width.<br />
Each time zone is 15 degrees of longitude in width,

Are you kidding...?<br />
<br />
Seriously. Time to engage the BRAIN. Is it working...? Let's test it.<br />
<br />
Ask yourself: What is the time difference between TIME ZONES RIGHT NEXT TO EACH OTHER?<br />
<br />
Next, ask yourself: HOW MANY HOURS IN A DAY?<br />
<br />
Next, if you STILL need to continue with mental prodding, ask yourself: HOW MANY TIME ZONES ARE THERE POSSIBLE ON PLANET EARTH? Thus, ONE time zone would be...? [insert fraction equation here]

Time zones like Eastern, Central, and Mountain in the US...the whole globe is sliced into 'em, each one an hour "long". So if it's 4:00 Eastern time, it's 5:00 Central, 6:00 Mountain, etc.<br />
<br />
So your teacher wants to know in miles (or kilometers if that's how s/he rolls) each segment is. How many miles wide is, say, the Central time zone from its eastern edge to its western.<br />
<br />
Chances are that your teacher wants an average of how wide *all* the time zones are, not any one specifically. <br />
<br />
Hope that helped!

Circumference of the Earth, divided by 24 = But wait... At the North Pole, you can take 24 steps and travel to all 24 time zones...

I think I might have misread the question at first. The Q I anwered was "how wide is a time zone." Where I got that, I haven't a clue. What I think "What is the starting point for time zones?" means that there is a specific place/time zone that is always counted first. That one is 1, say, and the one next to it is 2, etc. I think Teach wants to know what that place is called. (hope that wasn't too confusing...I was trying to point without telling you the answer) Sorry I messed up before.

Each time zone is 15 degrees of longitude in width, no more help from me

Yeah......I didn't ask for the answer! I just didn't get the question! I would like to figure it out myself, thank you very much.

1 hour's time, the distance the earth turns in that time