A person rowing at the rate of 5km h
Asked by admin @ in Math viewed by 329 People
A person rowing at the rate of 5km/hr in still water takes thrice as much as time going in 40km upstream as going 40km downstream.find
the speed of the stream
Answered by admin @
Speed of the boat in water =.5 km/hr
Let the speed of the stream be x km/hr
So, the speed of the boat upstream will be
(5-x) km / hr
So, the speed of the boat downstream is (5+x)
k/hr
Time given to cover 40 km upstream = 3(time
taken to cover dowmstream)
⇒40/ (5-x) km/hr = 3(5+x)
⇒1/(5-x)=3(5+x)
⇒5+x=15-3x
⇒x+3x=15-5
⇒4x=10
⇒X=10/4
⇒X=5/2
∴x=2.5 km/hr
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