SOLUTION: Chris's average speed for a 6 hour trip was 70 mph. For the first 4 hrs, Chris drove at 62 mph. What was his average speed for his last 2 hours of his trip?

Question 359494: Chris's average speed for a 6 hour trip was 70 mph. For the first 4 hrs, Chris drove at 62 mph. What was his average speed for his last 2 hours of his trip?
Found 2 solutions by mananth, robertb:
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
Chris's average speed for a 6 hour trip was 70 mph. For the first 4 hrs, Chris drove at 62 mph. What was his average speed for his last 2 hours of his trip?
..
so he drove 6*70 = 420 miles on the trip.
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4 hours 62mph
distance = 248 miles
Balance distance = 420-248=172
speed = distance/time
speed = 172/2
speed = 86 mph in the last two hours
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m.ananth@hotmail.ca
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Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
Chris's average speed for a 6 hour trip was 70 mph. For the first 4 hrs, Chris drove at 62 mph. What was his average speed for his last 2 hours of his trip?
The total distance traveled was miles. During the 1st four hours, The distance traveled was . Therefore 172 miles was traveled the last 2 hours, and the average speed would be miles per hour.
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