vt=s
t=s/v
t1z prądem=2000m/(2+0,8)m/s=714s=11,9min
t2pod prąd=2000m/(2-0,8)m/s=1667s=27,78min
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vt=s
t=s/v
t1z prądem=2000m/(2+0,8)m/s=714s=11,9min
t2pod prąd=2000m/(2-0,8)m/s=1667s=27,78min