1.

A boat goes 30 km. upstream and 44 km. downstream in 10 hours. In 13 hours, it can go 40 km upstream and 55 km down-stream. The speed of the boat in still water is ?

A. 6 km/hr
B. 3 km/hr
C. 4 km/hr
D. 8 km/hr
Answer» E.


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