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V1=55mph V2=50mph
Ida A-->B
x=V1t1
venida B--->A
x=V2t2
recorrido total 2x
se tiene que...t1+t2=7h... t1=7h-t2
igualando las dos ecuacioned para x
x=V1t1=V2t2
V1(7h-t2))=(V2t2)
V1(7h)=V2t2+V1t2
t2(V2+V1)=V1(7h)
t2=[V1(7h)/(V2+V1)]
t2=[(50(7)/(50+55)]
t2= 350/105
t2=3.33h
luego
x=V2t2
x=55(3.33)=183.5