നിശ്ചല ജലത്തിൽ ഒരു ബോട്ടിൻ്റെ വേഗം മണിക്കൂറിൽ 8 കി.മീറ്ററും ഒഴുക്കു വെള്ളത്തിന്റെ വേഗം മണിക്കൂറിൽ 2 കി.മീറ്ററും ആയാൽ ഒഴു ക്കിന് എതിരായി ബോട്ടിൻ്റെ വേഗത എന്ത്?
A6
B10
C8
D12
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