Correct Answer: A
Explanation:
A man is driving on a 360 mile trip. If his average speed is 42 miles per hour for the first 231 miles, what must his average speed be for the rest of the trip in order to finish the entire trip in 8 hours?
Time taken for the first part = 231 ÷ 42 = 5.5
Time for the second part = 8 - 5.5 = 2.5
Distance in the second part = 360 - 231 = 129
Speed for the second part = 129 ÷ 2.5 = 51.6