Question: A train travelled distances of 10 km, 20 km and 30 km at speeds of 50 km/hr, 60 km/hr and 90 km/hr respectively. The average speed of the train was
Options
A : 67.25 km/hr
B : 69.23 km/hr
C : 70.12 km/hr
D : 72.45 km/hr
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