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[" 11.A man walks on a straight road fro...

[" 11.A man walks on a straight road from his home to a mathe "],[2.5km" away with a speed of "5km/h" .Finding the mate "],[" closed,he instantly turns and walks back home with a spea "],[" of "7.5km/h" .The average speed of the man over the intern "],[" of time "0" to "40min" .is equal to "],[[" (a) "5km/h," (b) "(25)/(4)km/h],[" (c) "(30)/(4)km/h," (d) "(45)/(8)km/h]]

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