ഒഴുക്കിനൊപ്പം ഒരു ബോട്ടിന്റെ വേഗം 13 കി. മീ. ആണ്. ഒഴുക്കിന്റെ വേഗം 2.5 കി. മീ. ആയാൽ ഒഴുക്കിനെതിരെ ബോട്ടിന്റെ വേഗം എന്ത് ?
A8.5 കി. മീ
B9.5 കി. മീ.
C8 കി. മീ.
D10.5 കി. മീ.
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