concept of speed of upstream and down stream sums in pair of linear equations
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if the boat in upstream then the boat should spend more energy so there will be loss of energy so
for upstream for gn condition will be
rate of downstream km/hr/x-y
in the case of downstream u won't spend such energy while driving down so there will not be much loss of energy so gn condition is
rate of speed in km/hr/x+y
for upstream for gn condition will be
rate of downstream km/hr/x-y
in the case of downstream u won't spend such energy while driving down so there will not be much loss of energy so gn condition is
rate of speed in km/hr/x+y
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