ഒരാൾ ഒഴുക്കിനൊപ്പം ഒരു കിലോമീറ്റർ നീന്താൻ 4 മിനിറ്റും ഒഴുക്കിനെതിരെ അത്രയും ദൂരം നീന്താൻ 10 മിനിറ്റും എടുക്കുന്നു. ഒഴുക്കിന്റെ വേഗമെന്ത് ?
A4.5 km/h
B4 km/h
C9 km/h
D5.6 km/h
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