Are coworkers supposed to help each other?

Im still new at my job and I work at hospital and I interview people Im in information on my duty today so many people are asking me about patients status answering phone calls left and right while writing names of watcher patients and at the same time encoding it on computer and some of my co workers help me but this one lady said "I will share my salary with her or them because they helped me at my job" maybe she's joking? ... I don't know too but she sound serious
Are coworkers supposed to help each other?
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