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Пока думала, как покороче написать сюда свою писанину с листочка, нашла в инете короче и понятнее некуда, вот:
t1=t0-1
t2=t0+1
t1+1=t2-1
t=S/v
S/15+1=S/10-1
S=60
t1=4, t2=6, t0=5
v0=S/t0=60/5=12

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