I've had difficulties finding problems that I worked on and when I have the answer I can't find the problem.

Can you help me identify these problems?

3 circles touch tangentially with diameters 3, 2, and 1. Find the radius of the largest circle that can be drawn in the space formed by the 3 circles.

Train leaves Canberra for Sydney at noon. Another leaves Sydney for Canberra forty minutes later. If each travel at the same rates taking 3 1/2 hours, what time do they meet?

Please identify these problems. Thanks.

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Easy Math Editor

`*italics*`

or`_italics_`

italics`**bold**`

or`__bold__`

boldNote: you must add a full line of space before and after lists for them to show up correctlyparagraph 1

paragraph 2

`[example link](https://brilliant.org)`

`> This is a quote`

Remember to wrap math in \( ... \) or \[ ... \] to ensure proper formatting.`2 \times 3`

`2^{34}`

`a_{i-1}`

`\frac{2}{3}`

`\sqrt{2}`

`\sum_{i=1}^3`

`\sin \theta`

`\boxed{123}`

## Comments

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TopNewestProblem 1 is Miscellaneous Problem Solving. One good way to keep track of problems you are working on is the "Save problem" feature.

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Thanks, Jon.

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You can use the search function at the top using select keywords. For example, question 2 is Easy #8.

I do not recall seeing question 1, and I can't find it either. Would you like to post it as a new question?

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Thanks, Calvin.

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