



 
What a strange thing to assume :P Oh, it's true (close enough for rock'n'roll); but it's not the fact that is easy to remember, historically interesting, and makes the math easy for this problem. That fact is:
So one degree of latitude (measured NS) is $111 \frac19$ kilometers; a kilometer, in a NS direction, is 0.009 degrees. So now you can solve your question easily. A degree of longitude, measured EW, is shorter except near the equator. A kilometer from the North Pole there are 360 degrees in a 1kmradius circle, so each one is only about 160m long! Up around 45N where I live, a degree of longitude is about 78 km. Very close to the equator a degree of longitude is actually longer because the earth's spin makes it slightly M&Mshaped.) Good Hunting!  


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. 