Hey guys !! please help me !!
Ques:- A person can row a boat at the rate of 5km/hr in still water he takes thrice as much time in going 40km upstream. find the speed of the stream.
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Answers
Answered by
1
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
not that one
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Answered by
0
Answer:
hey mate here is your answer
Consider,
Speed of rowing by a person =5 km/hr.
Speed of stream =x km/hr
Upstream Speed =(5−x) km/hr
Downstream speed =(5+x) km/hr
According to the question,
⇒
5−x
40
=
5+x
3×40
⇒5+x=15−3x
⇒4x=10
⇒x=2.5 km/hr
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