A car travelled 100km with half the distance at 40kmph and the other half at 80kmph . [Archive]

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tianyi97

Oct 8, 2010, 10:30 PM

Fing average speed

Unknown008

Oct 9, 2010, 06:17 AM

Find the time taken in each part of the journey.

Time taken for 1st half = Distance/Speed = 50/40 = 1.2 h
Time taken for 2nd half = 50/80 = 0.625 h

Average\ Speed = \frac{Total\ Distance}{Total\ Time}

Post what you get! :)