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math

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My brother and I walk the same route to school every day. My brother takes 40 minutes to get to school and I take 30 minutes. Today, my brother left 8 minutes before I did. How long will it take me to catch up with him?

  • math - ,

    Let the distance to school S, my speed=S/30
    the speed of my brother=S/40 and
    I catch up with him after t min.
    Then
    S/40*(t+8)=S/30*t
    30t+240=40t

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