പുഴയിൽ ഒഴുക്കിന് എതിരായി മണിക്കൂറിൽ 8 കി.മീ വേഗത്തിലും അനുകൂലമായി അതിലിരട്ടി വേഗത്തിലും ഒരു ബോട്ട് നീങ്ങുന്നു. നിശ്ചല ജലത്തിൽ ബോട്ടിന്റെ വേഗതയെന്ത് ?
A12 കി.മീ / മണിക്കൂർ
B10 കി.മീ / മണിക്കുർ
C14 കി.മീ / മണിക്കുർ
D9 കി.മീ / മണിക്കുർ
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