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Thread: Revolving Door

  1. #1
    Trying to make mom and pop proud
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    Revolving Door

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    Hi there!

    Here below is a maths test question for 15-year olds. Just give it a try:

    A revolving door has three areas within a circular-shaped space. In one minute the door goes around 4 times. Two people can fit in each of the three door sectors.

    What is the maximum number of people that can enter the building through the door in 30 minutes?

    (The diameter of the circle = 200 cm, the Exit being located just opposite the Entrance).
    Last edited by Tristar; 06-04-2015 at 08:31 AM.

  2. #2
    Trying to make mom and pop proud
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    Re: Revolving Door

    Quote Originally Posted by Tristar View Post
    Hi there!

    Here below is a maths test question for 15-year olds. Just give it a try:

    A revolving door has three areas within a circular-shaped space. In one minute the door goes around 4 times. Two people can fit in each of the three door sectors.

    What is the maximum number of people that can enter the building through the door in 30 minutes?

    (The diameter of the circle = 200 cm, the Exit being located just opposite the Entrance).
    I think it is 24 * 30 = 720.

  3. #3
    Trying to make mom and pop proud
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    Re: Revolving Door

    Yes, the correct answer is 720 people.

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