Asked by Matthew
                A cyclist covers his outward journey downhill at 24mph. His return journey, over  exactly the same distance uphill, is covered at only 12mph. What is the cyclist's average speed over the entire journey?
            
            
        Answers
                    Answered by
            Steve
            
    If the distance each way is x, then since speed = distance/time,
2x/(x/24 + x/12) = 2x/(3x/24) = 16
    
2x/(x/24 + x/12) = 2x/(3x/24) = 16
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