An equilateral triangle ABC is sliding along the floor. At a certain moment, the velocity of point A is directed along AB and has a magnitude v, while the velocity of point B is directed along BC. What is the speed of point C at that moment?

The 2017-2018 season of Challenges had a great finish, with many readers from all over the world submitting their solutions to our March, April and May problems.

We are pleased to recognize the following contributors:

Many thanks to all contributors and we hope to hear from many more of you in the future!

Note: as always, we would very much appreciate reader-contributed original Challenges.

Boris Korsunsky, Column Editor

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