A boy walks to his school at a distance of 6 km with a speed of 2.5 kmh'1 and walks back with a constant speed of 4 kmh'1. His average speed for round trip expressed in kmh'1 is

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A boy walks to his school at a distance of 6 km with a speed of 2.5 kmh'1 and walks back with a constant speed of 4 kmh'1. His average speed for round trip expressed in kmh'1 is