One third of a certain journey is covered at the rate of 25 km/hour, one fourth at the rate of 30 km/hour and the rest at 50 km/hour. the average speed for the whole journey is
a.35 km/hour
b.km/ hour 3 331
c.30 km/hour
d.km/ hour 12 37
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The average speed of the vehicle is 35km/h.
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