Ritu can row downstream 20 km in2 hrs and upstream 4 km in 2 hrs.Find her speed of rowing in still water and the speed of the current
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downstream speed =20/2=10km/hr
upstream speed =4/2=2km /hr
speed of rowing =D +U /2 =10+2/2 =6 km/hr
and speed of current D -U /2=10-2/2 =4 km/hr
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