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211243
@211243
July 2022
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Verified answer
S=S1+S2+S3
S1=S/2
T=T1+T2+T3
T2=(T2+T3)/2
S1=v1*T1
S2=v2*T2
S3=v3*T3
v=S/T=?
****************
T2=(T2+T3)/2 => 2*T2=(T2+T3) => T2=T3
S3=v3*T3
S2=v2*T2=v2*T3
S=S1+S2+S3;S1=S/2 => 2*S1=(S1+S2+S3) => S1=S2+S3=v2*T3+v3*T3
S=S1+S2+S3=2*v2*T3+2*v3*T3=2*(v2+v3)*T3
T1=S1/v1=(v2*T3+v3*T3)/v1=T3*(v2+v3)/v1
T=T1+T2+T3=T3*(v2+v3)/v1+T3+T3=T3*((v2+v3)/v1+2)
v=S/T=2*(v2+v3)*T3 : T3*((v2+v3)/v1+2) =
=2*(v2+v3) : ((v2+v3)/v1+2) =
=(2*v1)*(v2+v3) : ((v2+v3)+2*v1) =
=(2*24)*(12+6) : ((12+6)+2*24) км/час =
13,(09)
км/час ~ 13,1 км/час
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Answers & Comments
Verified answer
S=S1+S2+S3S1=S/2
T=T1+T2+T3
T2=(T2+T3)/2
S1=v1*T1
S2=v2*T2
S3=v3*T3
v=S/T=?
****************
T2=(T2+T3)/2 => 2*T2=(T2+T3) => T2=T3
S3=v3*T3
S2=v2*T2=v2*T3
S=S1+S2+S3;S1=S/2 => 2*S1=(S1+S2+S3) => S1=S2+S3=v2*T3+v3*T3
S=S1+S2+S3=2*v2*T3+2*v3*T3=2*(v2+v3)*T3
T1=S1/v1=(v2*T3+v3*T3)/v1=T3*(v2+v3)/v1
T=T1+T2+T3=T3*(v2+v3)/v1+T3+T3=T3*((v2+v3)/v1+2)
v=S/T=2*(v2+v3)*T3 : T3*((v2+v3)/v1+2) =
=2*(v2+v3) : ((v2+v3)/v1+2) =
=(2*v1)*(v2+v3) : ((v2+v3)+2*v1) =
=(2*24)*(12+6) : ((12+6)+2*24) км/час =13,(09)км/час ~ 13,1 км/час