a boat travels 25 km upstream in 6 hr and 20 kms downstream in 4 hrs . then , the speed of a boat in still water and the speed of water current are respectively
1) 4km/hr and 3 km/hr
2) 4.5 km/hr and 0.5km/hr
3) 4km/hr and 2 km/hr
4) 5 km /hr and 2km/hr
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