SOLUTION: A train travels half the distance from 30 km/hr and the remaining half with 60km/hr. What is it's average speed ?

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Question 595868: A train travels half the distance from 30 km/hr and the remaining half with 60km/hr. What is it's average speed ?
Answer by Alan3354(69443) About Me  (Show Source):
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A train travels half the distance from 30 km/hr and the remaining half with 60km/hr. What is it's average speed ?
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Avg = 2*30*60/(30+60) = 3600/90
Avg = 40 km/hr
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This formula applies only if the distances are equal.