guys guys ,,
well you both are right in your own senses,
let me clarify
in the US of A its called victor airways,prefixed V or J and is 8 NM wide (4 nm either side).
in Europe its called airways , prefixed U and is 10 NM ( 5 nm either side ).
and logically we here in India normally follow the British way so it has to be 10 NM.
well doesn't make much of a difference anyways check it out as well
http://en.wikipedia.org/wiki/Airway_(aviation)