SOLUTION: How i will solve this problem: Andy's average driving speed for a 4-hours trip was 45 miles per hour. During the first 3 hours he drove 40 miles per hour. What was his average s

Algebra ->  Complex Numbers Imaginary Numbers Solvers and Lesson -> SOLUTION: How i will solve this problem: Andy's average driving speed for a 4-hours trip was 45 miles per hour. During the first 3 hours he drove 40 miles per hour. What was his average s      Log On


   

Question 368881: How i will solve this problem:
Andy's average driving speed for a 4-hours trip was 45 miles per hour. During the first 3 hours he drove 40 miles per hour. What was his average speed for the last hour of his trip?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
Average speed = 45 mph
time = 4hours
distance traveled = 4*45 =180 miles.
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first 3 hours average was 40 mph.
distance traveled = 40*3= 120 miles.
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Balance 60 miles he drove in 1 hour.
so average speed = 60mph.
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m.ananth@hotmail.ca