I want to figure out the reason as to why we can't say How was your travel? Some say that's because travel as a noun is rarely used and when it's used it should be in plural so does that mean we could ask - How were your travels ? instead? Then here comes another question - How is it possible for uncountable noun to be used in plural form? If the sole "travel"(n) is considered to have a general meaning then would it be right to form the same question by using the compound form - How was your business travel? or where did you go on your business travel?
As you've noticed, I'm going over one type of question because I want to dive more in a sense than sort of grammar trivials. My aim is to know the key thing - the connotation travel owns itself as a noun which makes it unable to be used interchangeably with trip in this perspective. In my opinion there has to be a reasonable explanation about why travel doesn't fit in with the above question. Hope I could get it across what I'm trying to say and get decent answers with a logical approach.