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A train that is 1 mile long starts through a tunnel that is also 1 mile long. The train is traveling 15 miles per hour. How long does it take for the train to get completely out of the tunnel?

  • Math -

    Use this proportion. Cross multiply and solve for x -- the time it takes the front of the train to go through the tunnel.

    15/60 = 1/x
    15x = 60
    x = 60/15 = 4 minutes for the front of the train to go through the tunnel.

    It takes the rear of the train the same time.

  • Math -

    7.5 min

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