Jesse, Devin, Seth and Antonio have to walk through a long dark tunnel. They only have one torch between them so a maximum of two people can go through the tunnel at any one time. Each person takes a different amount of time to get through the tunnel and if two people walk together they must walk at the rate of the slowest.
Jesse takes 3 minutes,
Devin takes 5 minutes,
Seth takes 8 minutes,
Antonio takes 10 minutes.
What is the least amount of time for all four to walk through the tunnel?
If Seth and Antonio walk through the tunnel together it will take 10 minutes, If Seth then walks the torch back through the tunnel a total of 18 minutes will have passed. Continue till all four are at the other end of the tunnel.
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Jesse and Devin walk through taking 5 minutes
Jesse walks back with the torch taking 3 minutes [8 minutes total]
Seth and Antonio walk through taking 10 minutes [18 minutes total]
Devin walks back with the torch taking 5 minutes [23 minutes total]
Jesse and Devin walk through taking 5 minutes [28 minutes total]
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Casio Classwiz Calculator
There is currently a lot of talk about this new calculator being the best in its price range for use in the Maths classroom. The new ClassWiz features a high-resolution display making it easier to view numerical formulas and symbols but it isn't a graphical calculator as such (it has the capacity to draw graphs on your smart phone or tablet, via a scannable QR code and an app).
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This calculator has a high-performance processor and twice the memory of previous models ensuring speedy operation and superior computational power.more...
Teacher, do your students have
access to computers?
Here a concise URL for a version of this page without the comments.
Here is the URL which will take them to Tran Tunnels, a mathematical adventure.