I think there are two ways to look at (b). I'd agree that generally the problems we all solve are not particularly time critical, when you're working on somethi

I think there are two ways to look at (b). I'd agree that generally the problems we all solve are not particularly time critical, when you're working on something over a week or month, there's not going to be anything which needs doing in ten minutes. On the other hand, when you're supporting live systems, there can be times when being able to diagnose and fix a problem in a few minutes, under pressure, can be a valuable skill. It's at times like that that you need people who can solve problems quickly in stressful situations. I'm not particularly saying that these types of questions will help you find those people, but if it's something you want to test for then they may be useful.