SOLUTION: A car goes up a hill at 30 km/hr and comes down the same hill at 90 km/hr.Find car's average speed for this trip?

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Question 874514: A car goes up a hill at 30 km/hr and comes down
the same hill at 90 km/hr.Find car's average
speed for this trip?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
A car goes up a hill at 30 km/hr and comes down
the same hill at 90 km/hr.Find car's average
speed for this trip?
================
Avg = 2*30*90/(30+90)
= 45 km/hr