If a boat can go down stream 25 km in 2 hours, and upstream 5 km in 2 hours, then find the speed of boat and of stream.

1
Boat = 10kmph ; stream = 4kmph 
2
Boat = 12kmph ; stream = 5 kmph
3
Boat = 7.5kmph; stream = 5kmph 
4
Boat = 10.5 kmph ; stream = 4.5kmph

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