Final answer:
Joseph runs a 6-mile race in 45 minutes.
Step-by-step explanation:
The time it takes for Joseph to run a 6-mile race is 45 minutes, which is indicated by choice (b). Choice (a) 6 minutes is incorrect because it is not enough time for a 6-mile race. Choice (c) 6 hours is also incorrect because it is too long for a 6-mile race. Choice (d) 45 seconds is incorrect because it is too short for a 6-mile race.