As a dane who have worked with a lot of swedes and norwegians, I have always found that everyone was able to communicate by speaking their own language (with the exception of the danish numbers), as longs as you take care to speak clearly and not too fast. Obviously it depends a lot on dialects as well, but honestly there are danish dialects I find harder to understand that swedish or norwegian. However, my experience is that younger scandinavians, meaning below 25 tends to switch to english rather than make the effort of understanding each other.
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As a dane who have worked with a lot of swedes and norwegians, I have always found that everyone was able to communicate by speaking their own language (with the exception of the danish numbers), as longs as you take care to speak clearly and not too fast. Obviously it depends a lot on dialects as well, but honestly there are danish dialects I find harder to understand that swedish or norwegian. However, my experience is that younger scandinavians, meaning below 25 tends to switch to english rather than make the effort of understanding each other.