A man can row a boat 18 km downstream and return upstream to the original point in 5 hours 36
minutes. If the speed of stream is 2 km/hr. Then the speed of boat in still water is
(A) 10 km/hr (B) 6 km/hr (C) 5 km/hr (D) 7km/hr
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Answer:5km/hr
Step-by-step explanation:Aman row a boat 18km distance downstream and return traveling the same distance back to same point i. e. 18km
The total distance travelled is 36km in the time span of 5hrs 36min
The speed of man boating will be
Speed=dis/time =36km/5. 36hrs=6.7km=7km/hrs(approx)
With speed of stream 2km/hrs
When the water is still the speed will be only what a man will put as per efforts so we will minus 2km/hr from 7km/hrs
7-2=5km/hrs
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