In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is :
A3 km/hr
B8 km/hr
C5 km/hr
D9 km/hr
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ഒഴുക്കിനൊപ്പം ഒരു ബോട്ടിന്റെ വേഗം 13 കി. മീ. ആണ്. ഒഴുക്കിന്റെ വേഗം 2.5 കി. മീ. ആയാൽ ഒഴുക്കിനെതിരെ ബോട്ടിന്റെ വേഗം എന്ത് ?
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