Ответ:
l1+l2=200+700=900
t2+t3=10+20=30
Vсер=l1+l2/t1+t2=900:30=30
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Ответ:
l1+l2=200+700=900
t2+t3=10+20=30
Vсер=l1+l2/t1+t2=900:30=30