Answered

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11. O trenzinho da OBMEP tem 60 metros de
comprimento e anda com velocidade constante. Ele
demora um minuto para passar completamente pela
entrada de um túnel e, depois que passou, dez minutos
para começar a sair do túnel. Qual é o comprimento do
túnel?
(A) 720 metros
(B) 840 metros
(C) 900 metros
(D) 660 metros
(E)
780 metros

Sagot :

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