Discussion
A steamer goes downstream from one port to another in 4 hours, it covers the same distance upstream in 5 hours. If the speed of the stream is 2km/hr,the distance between the two parts is?
Answer: D
Let the distance between the two parts be x km.
Then speed downstream = x/4 km/hr.
Speed Upstream = x/5 km/hr
Speed of the stream = ½ (x/4 -x/5)
Therefore, ½(x/4 -x/5) = 2. => x/4 -x/5 = 4 => x = 80.
Hence, the distance between the two ports is 80km.
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