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

Question 359868: Chris's average speed for a 6 hour trip was 70mi/h. for the first 4 hours, Chris drove at 62 mi/hr. What was his average speed for his last 2 hours of his trip?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
Chris's average speed for a 6 hour trip was 70mi/h. for the first 4 hours,
Chris drove at 62 mi/hr.
What was his average speed for his last 2 hours of his trip?
:
Let s = av speed for the last two hrs
:
Write a distance equation, dist = speed * time
:
62(4) + 2s = 6(70)
248 + 2s = 420
2s = 420 - 248
2s = 172
s = 86 mph for the last two hrs to average 70 mph for the trip
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