A man goes First 30 km of his journey at the speed of 15km/hr , next 40km of this journey with 10km/hr and last 30 km of his journey with 30km/hr. Then calculate the average speed of the man.
A50/14 km/hr
B100/3 km/hr
C100/7 km/hr
DNone of these
A50/14 km/hr
B100/3 km/hr
C100/7 km/hr
DNone of these
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