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A rikhshaw covered 2 km/hr and return back at a speed of 11 km/hr find the average speed of the rickshaw

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total distance: 2
total time: 1/2 + 1/11 = 13/22
avg speed is thus 2*13/22 = 13/11

or, viewed as a classic work problem, the avg speed is

2/x = 1/2 + 1/11

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