നിശ്ചല ജലത്തിൽ ഒരു ബോട്ടിന്റെ വേഗം മണിക്കൂറിൽ 7 കി.മീറ്ററും ഒഴുക്കു വെള്ള ത്തിൻ്റെ വേഗം മണിക്കൂറിൽ 3 കി.മീറ്ററും ആയാൽ ഒഴുക്കിന് അനുകൂലമായി ബോട്ടിൻ്റെ വേഗത എന്ത്?
A15 km / h
B13 km / h
C10 km / h
D8 km / h
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