Ritu can row downstream 20 km in 2 hours, and upstream 4 km in 2 hours. Her speed of rowing h still water and the speed of the current respectively are: a) 4 km/h, 4 km/h (b) 6 km/h, 4 km/h (c) 6 km/h, 6 km/h (d) 4 km/h, 6 km/h.
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option (B) 6km/h, 4km/h
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