Q20
The speed of boat upstream and speed
of boat downstream are 7 km/h and 13
km/h, respectively. Then the speed of
stream and the speed of boat in still
water is?
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Answer:
Rate in still water=[(1/2)(u+v)] km/h
Rate of current=[(1/2)(u-v)] km/h
where u= speed of boat in downstream
v=speed of boat in upstream
Speed of boat in still water=[(1/2)(7+13)] =10 km/h
Speed of the stream =[(1/2)(13-7)]=3 km/h
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