Ответ:
v cp= S/t=S/(t1+t2+t3)=S/(S/(2×v1)+S/60×(15+45)=(2×60+15+45)км/час=40км/час.
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Ответ:
v cp= S/t=S/(t1+t2+t3)=S/(S/(2×v1)+S/60×(15+45)=(2×60+15+45)км/час=40км/час.