In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is :
A3 km/hr
B8 km/hr
C5 km/hr
D9 km/hr
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ഒരാൾ ഒഴുക്കിനൊപ്പം ഒരു കിലോമീറ്റർ നീന്താൻ 4 മിനിറ്റും ഒഴുക്കിനെതിരെ അത്രയും ദൂരം നീന്താൻ 10 മിനിറ്റും എടുക്കുന്നു. ഒഴുക്കിന്റെ വേഗമെന്ത് ?