A person goes 20 km in downstream and 10 km in upstream in the same duration of time. Find the speed of the stream, if the speed of the boat in still water is 2 Km / hour.

1
3/4 km/hour
2
2/3 km/hour
3
5/6 km/hour
4
4/5 km/hour
5
3/5 km/hour

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