SOLUTION: A man travelled from point A to point B by car at a speed of 40 km. per hour and returned to point A at speed 50 km. per hour . Find the average speed in the whole journey .

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Question 828278: A man travelled from point A to point B by car at a speed of 40 km. per hour and returned to point A at speed 50 km. per hour . Find the average speed in the whole journey .
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
we need to know the time or distance involved