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?

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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) About Me  (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?
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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) About Me  (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 70+%2A+6+=+420miles. During the 1st four hours, The distance traveled was 62%2A4+=+248. Therefore 172 miles was traveled the last 2 hours, and the average speed would be 172%2F2+=+86 miles per hour.