SOLUTION: A car travels 100 km at a speed of 60 km/h and returns with a speed of 40 km/h. Find the average speed for the whole journey

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Question 388680: A car travels 100 km at a speed of 60 km/h and returns with a speed of 40 km/h. Find the average speed for the whole journey
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
We can use the harmonic mean of the two rates: H+=+2%2F%281%2F40+%2B+1%2F60%29+=+48km/hr.