rozwiąż
1.
t=5h-3h=2h
t=t₁+t₂
t=s/v₁+s/v₂
t=s/(vw+vr)+s/(vw-vr)
2=s/(18+3)+s/(18-3)
2=s/21+s/15 /*105
210=5s+7s
210=12s /:12
s=17,5[km]
2.
10%-------------4-0=4
---------4%---------
0%----------------10-4=6
4/6=0,5/x
4x=3
x=3/4[l]
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1.
t=5h-3h=2h
t=t₁+t₂
t=s/v₁+s/v₂
t=s/v₁+s/v₂
t=s/(vw+vr)+s/(vw-vr)
2=s/(18+3)+s/(18-3)
2=s/21+s/15 /*105
210=5s+7s
210=12s /:12
s=17,5[km]
2.
10%-------------4-0=4
---------4%---------
0%----------------10-4=6
4/6=0,5/x
4x=3
x=3/4[l]