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Cel mai inteligent răspuns!
2014-07-31T11:38:13+03:00
V1-viteza in directia de curgere
V2-viteza in directia opusa curgerii
V1=d/t1=3/4=0.75 m/s
V2=d/t2=3/5=0.6 m/s
dar V1=Vpeste+Vrau
      V2=Vpeste-Vrau
daca aduni cele 2 relatii 
V1+V2=2Vpeste
0.75+0.6=2Vpeste⇒Vpeste=1.35/2=0.675 m/s
V1=Vpeste+Vrau
0.75=0.675+Vrau⇒Vrau=0.75-0.675=0.075 m/s
5 4 5