1.  In one hour, a boat goes 11 km along the stream and 5 km against the stream. The speed of the boat in still water (in km/hr) is :
A. 3 km/hr
B. 5 km/hr
C. 8 km/hr
D. 9 km/hr

Answer: Option C

Explanation:

Speed in still water = 1 (11 + 5) kmph = 8 kmph.
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