1.

A man rows down a river 15 km in 3 h with the steam and returns in 7 1/2 h. The rate at which he rows in still water is L

A. 2.5 km/h
B. 1.5 km/h
C. 3.5 km/h
D. 4.5 km/h
Answer» D. 4.5 km/h


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