1.

A steamer moves with a speed of 4.5 km/h in still water to a certain upstream point and comes back to the starting point in a river which flows at 1.5 km/h. The average speed of steamer for the total journey is

A. 12 km/h
B. 10 km/h
C. 6 km/h
D. 4 km/h
Answer» E.


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