Speed is just one dimension of intelligence, no?

Who's more intelligent, person A that would score 80% on a test given 30 minutes, and 85% given 60 minutes; or person B that would score 50% given 30 minutes, but 99% given 60 minutes?

Person A might be perceived as quick, have an accurate intuition, and able to come up with a lot of ideas. Person B on the other hand is of the slow and steady kind that will methodically and tirelessly work on a problem until it's solved.