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During first half of a journey by a body it travel with a speed of 40 km/hr and in the next half it travels with a speed of 20 km/hr.

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During first half of a journey by a body it travel with a speed of 40 km/hr and in the next half it travels with a speed of 20 km/hr. Calculate the average speed of the whole journey.

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Speed during first half (v1) = 40 km/hr

Speed during second half (v2) = 20 km/hr

Average speed by an object (body) = 30 km/hr. 

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