The speed of boat upstream and speed of boat downstream are 6km/h and 10km/h. what is the speed of stream and speed of boat in still water?

1
3km/h. and 10km/h.
2
9km/h. and 15km/h.
3
 2km/h. and 8km/h.
4
9km/h. and 11km/h.

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