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75. A man walks on a straight road from his home to a market 2.5 km away with a speed of 5km/h. Finding the market closed ,he instantly turns and walk back home with a speed of 7.5km/h . The average speed of man over the interval of time 0 to 40 minutes is equal to what ?

Answer» 75. A man walks on a straight road from his home to a market 2.5 km away with a speed of 5km/h. Finding the market closed ,he instantly turns and walk back home with a speed of 7.5km/h . The average speed of man over the interval of time 0 to 40 minutes is equal to what ?


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