one third of a certain journey is covered at the rate of 25 km/hr one fourth at the rate of 25 km/hr and the rest at 30 km/hr find the average speed
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25 km per hour, one fourth at rate of 30 km per hour and the rest of 50 km per hour. The average speed for whole journey is... A33 1/3 km/hr; B66 1/3 ..
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