SOLUTION: Suppose Mr. Taylor's speed during journey from Pittsburgh to Chicago was 'x' mph. So his speed during journey from Chicago to Pittsburgh was 'x+15' mph.
Time taken in up-journey
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Question 40887: Suppose Mr. Taylor's speed during journey from Pittsburgh to Chicago was 'x' mph. So his speed during journey from Chicago to Pittsburgh was 'x+15' mph.
Time taken in up-journey = hrs.
Time taken in down-journey = hrs.
As down-journey takes 2 hrs. more so
or
or
or
or
Factorising
But here speed cannot be negative (as then the car goes in opposite direction and the problem is not valid) so x not equal to -75.
Hence x = 60.
Ans.: Thus the average speed of Mr. Taylor's car from Pittsburgh to Chicago was 60 mph.
Answer by psbhowmick(878) (Show Source): You can put this solution on YOUR website!
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