a motor boat whose speed is 20km/hr in still water ,takes 1 more to go upstream than downstream to the same spot . find the speed of the stream?
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a motor boat whose speed is 20km/hr in still water ,takes 1 more to go upstream than downstream to the same spot . find the speed of the stream?
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Answer:
Let, the speed of the stream be x km/hr
Speed of boat in still water =20 km/hr
∴Speed of boat with downstream 20+x km/hr
∴ Speed of boat with upstream 20−x km/hr
see in image
Either, x=4 or x=−100
∵ Speed cannot be negative ∴x=4 km/hr is considered.
∴ the speed of the stream =4 km/hr