I see for quite a few times that some people use the word "approximate" this way: <br/><br/>1. They will suffer an approximate three weeks delay in the receipt of the cargo. <br/><br/>2. I arrived at Shanghai at approximate 9 o'clock on 7 May 2006.<br/><br/>I think that both of the two sentences erred grammatically on the use of approximate as it is an adjective(the two sentences call for an adverb). <br/><br/>so I'd like you to kindly clarify whether I'm right or wrong.