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  1. A steamer goes downstream from one port to another in 4 h. It covers the same distance upstream in 5 h. If the speed of the stream is 2 km/h, then find the distance between the two ports. ?
    1. 50 km
    2. 60 km
    3. 70 km
    4. 80 km
Correct Option: D

Let the distance between the two ports be x km.
Then, speed downstream = x/4
And speed upstream = x/5
∴ Speed of the stream = [speed downstream + speed upstream] / 2 = (x/4 - x/5)/2
⇒ (5x -4x)/40 = 2
⇒ x/40 = 2
∴ x = 80 km



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