SAT Math Multiple Choice Practice Question 77: Answer and Explanation

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Question: 77

11. Owen needs to travel 400 miles in 8 hours. If he averages m miles per hour for the first three hours, what does his average speed need to be for the remaining 5 hours?

D. 50 - m/3
E. 80 - 3m

Correct Answer: A


A. You know that distance = speed × time, so Owen has traveled 3m miles so far. That journey leaves him with 400 - 3m miles still to go in 5 hours. Because distance = speed × time, speed = distance/time, and Choice (A) is your answer.

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