A person, rowing at the rate of 5 km/hr in still water, takes thrice as much time in going 40 km upstream as in going downstream. Find the speed of the stream.
Pls tell how to solve this
Let the speed of the stream be xkm/hr
Given that speed of the boat is 5km/hr
Therefore, speed of the boat in downstream= (5+x)km/hr
Speed of the boat in upstream= (5-x) km/hr
Time taken by boat in going 40km upstream is thrice the time taken by the boat in the downstream
160x = 400
Therefore, x= 2.5km/hr
Hence, speed of the stream is 2.5km/hr.