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2015-06-22T10:23:08+05:30

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Time to cover first half =  \frac{1}{40} hrs
Time to cover the second half =  \frac{1}{v} hrs
Average speed =  \frac{Total distance}{Total Time} = \frac{2}{ \frac{1}{40} + \frac{1}{v} } =48\ (given)

From the above equation v = 60 km/hr
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