If you have a lot of team work experience, you know that there are a lot of people like this. It is a fact that some people actually slow down the work than help the work. That is why this is a good question to ask. A good employee will know how to handle this situation. A bad employee will do all the work themselves. Although doing the work is good, it doesn't show that you can deal with different types of people.
This answer will also work if you leave out the last two sentences. But I included the last two sentences to emphasize that helping other people succeed is really the truth instead of just words. If you choose the right way to say something, it sounds much more believable.