The speed of a boat is 10 km/h in still water. It covers a distance of 90 km in 15 hours going upstream. What is the speed of the stream?
A6 km/h
B3 km/h
C5 km/h
D4 km/h
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പുഴയിൽ ഒഴുക്കിന് എതിരായി മണിക്കൂറിൽ 8 കി.മീ വേഗത്തിലും അനുകൂലമായി അതിലിരട്ടി വേഗത്തിലും ഒരു ബോട്ട് നീങ്ങുന്നു. നിശ്ചല ജലത്തിൽ ബോട്ടിന്റെ വേഗതയെന്ത് ?
In one hour, a boat goes 13 km/hr in the direction of the stream and 7 km/hr against the direction of the stream. What will be the speed of the boat in still water?