ritu can row downstream 20km in 2 hours and up stream 4 km in 2 hrs find her speed of rowing in still water and in stream water
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Ritu can row downstream 20 km in 2 hours
so, Speed of downstream,
Sd = 20/2 = 10km/h
Ritu can row upstream 4 km in 2 hrs
so, Speed of upstream,
Su = 4/2 = 2km/h
Speed of the boat in still water = 1/2( speed of downstream - speed of upstream) = 1/2( 10+2) = 1/2(12) = 6km / hr
Speed of the stream = 1/2( speed of downstream - speed of upstream) = 1/2(10-2) = 1/2(8) = 4km/hr
so, Speed of downstream,
Sd = 20/2 = 10km/h
Ritu can row upstream 4 km in 2 hrs
so, Speed of upstream,
Su = 4/2 = 2km/h
Speed of the boat in still water = 1/2( speed of downstream - speed of upstream) = 1/2( 10+2) = 1/2(12) = 6km / hr
Speed of the stream = 1/2( speed of downstream - speed of upstream) = 1/2(10-2) = 1/2(8) = 4km/hr
Harsh027:
where is the equation
speed of boat in still water and speed of stream are two formulas
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