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A train travels from A to B at speed of x km/hour and from B to A at speed of y km/hour. The average speed of the train from A to B and back to A, would be calculated by the


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Answer : (a) Arithmetic mean
Explanation : Average speed of the train is given by $\frac{x+y}{2}$ Which is the same as Arithmetic mean of x and y.
answered Jan 17, 2014 by yamini.v

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