A man rowing at the rate of 5km an hour is still water takes thrice as much time in going 40 km up the river as in going 40 km down.
Find the rate at which the river flows.
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ANSWER : 2.5 km/hr
Step-by-step explanation:
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,
40/( 5- x ) = (3) (40/( 5 + x ))
5+x=15−3x
⇒4x=10
⇒x=2.5 km/hr
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