Average speeds

a man drives from a to b at 30 km/hr which are 13 km apart. he then turns around and drives back from b to a. For the total journey (a to b, then b to a) the average speed was 60 km/hr. What speed did he drive back from b to a at?
Question asked by: montyspurs

Asked on: 29 Nov 2010

So you know that he drove at 30 on the 13 km out. So first thing to know is that the speed on the way back is a lot more. So presumably he drove at 90km/h on the way back so that 30 + 90 = 120 / 2 = 60 for the average?
By: knowitall
Replied at: 05 Dec 2010
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