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September 22, 2014

September 22, 2014

Posted by **Lindsay** on Friday, November 23, 2012 at 12:01am.

What is the average speed for the whole journey?

- math -
**Steve**, Friday, November 23, 2012 at 5:21amtotal distance = 30+60 km

total time = 30/25 + 60/20 = 21/5 hr

avg speed = 90km ÷ 21/5 hr = 150/7 km/hr

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